Weakness (CWE)
CWE-94: Improper Control of Generation of Code
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
How to prevent it (7 mitigations)
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Architecture and Design
Refactor your program so that you do not have to dynamically generate code.
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Architecture and Design
Run your code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which code can be executed by your product.
Examples include the Unix chroot jail and AppArmor. In general, managed code may provide some protection.
This may not be a feasible solution, and it only limits the impact to the operating system; the rest of your application may still be subject to compromise.
Be careful to avoid CWE-243 and other weaknesses related to jails.
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Implementation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
To reduce the likelihood of code injection, use stringent allowlists that limit which constructs are allowed. If you are dynamically constructing code that invokes a function, then verifying that the input is alphanumeric might be insufficient. An attacker might still be able to reference a dangerous function that you did not intend to allow, such as system(), exec(), or exit().
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Testing
Use dynamic tools and techniques that interact with the product using large test suites with many diverse inputs, such as fuzz testing (fuzzing), robustness testing, and fault injection. The product's operation may slow down, but it should not become unstable, crash, or generate incorrect results.
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Operation
Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).
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Operation
Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).
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Implementation
For Python programs, it is frequently encouraged to use the ast.literal_eval() function instead of eval, since it is intentionally designed to avoid executing code. However, an adversary could still cause excessive memory or stack consumption via deeply nested structures [REF-1372], so the python documentation discourages use of ast.literal_eval() on untrusted data [REF-1373].
Source: MITRE CWE-94
1,073 results · Clear filters · Feed
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Low 2.4
code-projects for Plugin AdminAddAlbum.php cross site scripting
A weakness has been identified in code-projects for Plugin 1.0. This affects an unknown part of the file /Administrator/PHP/AdminAddAlbum.php. This manipulation of the argument txtalbum causes cross site scripting. It is possible to initiate the attack remote…
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Low 2.4
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Low 2.4
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A weakness has been identified in heyewei JFinalCMS 5.0.0. This affects an unknown function of the file /admin/admin/save of the component API Endpoint. Executing a manipulation can lead to cross site scripting. The attack can be launched remotely. The exploi…
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Low 2.4
code-projects Online Student Management System Announcement Management index.php cross site scripting
A weakness has been identified in code-projects Online Student Management System 1.0. The impacted element is an unknown function of the file /admin/announcement/index.php?view=add of the component Announcement Management Module. This manipulation causes cros…
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Low 3.5
cym1102 nginxWebUI Web Management check cross site scripting
A vulnerability was identified in cym1102 nginxWebUI up to 4.3.7. The impacted element is an unknown function of the file /adminPage/conf/check of the component Web Management Interface. Such manipulation of the argument nginxDir leads to cross site scripting…
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Low 3.5
Portabilis i-Educar User Data meusdadod.php cross site scripting
A vulnerability was identified in Portabilis i-Educar up to 2.10. Affected by this vulnerability is an unknown functionality of the file /intranet/meusdadod.php of the component User Data Page. Such manipulation of the argument File leads to cross site script…
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Low 2.4
Edimax BR-6288ACL wiz_WISP24gmanual.asp wiz_WISP24gmanual cross site scripting
A vulnerability has been found in Edimax BR-6288ACL up to 1.12. Impacted is the function wiz_WISP24gmanual of the file wiz_WISP24gmanual.asp. Such manipulation of the argument manualssid leads to cross site scripting. The attack can be launched remotely. The …
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Low 2.4
D-Link DSL-6641K sp_pppoe_user.js doSubmitPPP cross site scripting
A vulnerability was found in D-Link DSL-6641K N8.TR069.20131126. Affected by this issue is the function doSubmitPPP of the file sp_pppoe_user.js. The manipulation of the argument Username results in cross site scripting. The attack may be launched remotely. T…
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Low 2.4
D-Link DSL-6641K Web ad_virtual_server_vdsl cross site scripting
A vulnerability was detected in D-Link DSL-6641K N8.TR069.20131126. Affected by this issue is the function ad_virtual_server_vdsl of the component Web Interface. Performing a manipulation of the argument Name results in cross site scripting. It is possible to…
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Low 3.5
projectworlds House Rental and Property Listing sms.php cross site scripting
A weakness has been identified in projectworlds House Rental and Property Listing 1.0. This vulnerability affects unknown code of the file /app/sms.php. This manipulation of the argument Message causes cross site scripting. It is possible to initiate the atta…
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Low 3.5
Bdtask Bhojon All-In-One Restaurant Management System User Information profile cross site scripting
A vulnerability was found in Bdtask Bhojon All-In-One Restaurant Management System up to 20260116. Impacted is an unknown function of the file /dashboard/home/profile of the component User Information Module. Performing a manipulation of the argument fullname…
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Low 2.4
rethinkdb Secondary Index cross site scripting
A vulnerability was identified in rethinkdb up to 2.4.3. Affected by this issue is some unknown functionality of the component Secondary Index Handler. Such manipulation leads to cross site scripting. It is possible to launch the attack remotely. The exploit …
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Low 2.4
iJason-Liu Books_Manager add_book_check.php cross site scripting
A vulnerability has been found in iJason-Liu Books_Manager up to 298ba736387ca37810466349af13a0fdf828e99c. This affects an unknown part of the file controllers/books_center/add_book_check.php. Such manipulation of the argument mark leads to cross site scripti…
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Low 3.5
code-projects Online Examination System Add Pages cross site scripting
A vulnerability has been found in code-projects Online Examination System 1.0. Affected is an unknown function of the component Add Pages. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit has been disclosed to …
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Low 3.5
pbrong hrms recruitment.go UpdateRecruitmentById cross site scripting
A vulnerability was detected in pbrong hrms 1.0.1. The affected element is the function UpdateRecruitmentById of the file /handler/recruitment.go. The manipulation results in cross site scripting. The attack may be launched remotely. The exploit is now public…
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Low 2.4
technical-laohu mpay User Center cross site scripting
A weakness has been identified in technical-laohu mpay up to 1.2.4. The affected element is an unknown function of the component User Center. This manipulation of the argument Nickname causes cross site scripting. The attack may be initiated remotely. The exp…
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Low 3.5
SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System api_patient_schedule.php cross site scripting
A vulnerability was found in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. This affects an unknown part of the file /php/api_patient_schedule.php. Performing a manipulation of the argument Reason results in cross site scripti…
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Low 3.5
SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System api_register_patient.php cross site scripting
A vulnerability has been found in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Affected by this issue is some unknown functionality of the file /php/api_register_patient.php. Such manipulation of the argument firstName/lastN…
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Low 3.5
lcg0124 BootDo ContentController save cross site scripting
A weakness has been identified in lcg0124 BootDo up to e93dd428ef6f5c881aa74d49a2099ab0cf1e0fcb. Affected is the function Save of the file /blog/bContent/save of the component ContentController. This manipulation of the argument content/author/title causes cr…
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Low 3.5
LigeroSmart index.pl cross site scripting
A security vulnerability has been detected in LigeroSmart up to 6.1.26. The affected element is an unknown function of the file /otrs/index.pl. Such manipulation of the argument TicketID leads to cross site scripting. It is possible to launch the attack remot…
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Low 3.5
LigeroSmart index.pl cross site scripting
A weakness has been identified in LigeroSmart up to 6.1.26. Impacted is an unknown function of the file /otrs/index.pl?Action=AgentTicketZoom. This manipulation of the argument TicketID causes cross site scripting. It is possible to initiate the attack remote…
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Low 2.4
Luxul XWR-600 Web Administration cross site scripting
A vulnerability was found in Luxul XWR-600 up to 4.0.1. The affected element is an unknown function of the component Web Administration Interface. The manipulation of the argument Guest Network/Wireless Profile SSID results in cross site scripting. The attack…
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Low 3.5
questdb ui Web Console cross site scripting
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Low 2.4
PHPGurukul Staff Leave Management System SVG File adminviews.py UPDATE_STAFF cross site scripting
A flaw has been found in PHPGurukul Staff Leave Management System 1.0. The affected element is the function ADD_STAFF/UPDATE_STAFF of the file /staffleave/slms/slms/adminviews.py of the component SVG File Handler. Executing a manipulation of the argument prof…
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Low 2.4
projectworlds House Rental and Property Listing complaint.php cross site scripting
A vulnerability was detected in projectworlds House Rental and Property Listing 1.0. This issue affects some unknown processing of the file /app/complaint.php. The manipulation of the argument Name results in cross site scripting. The attack may be launched r…
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Low 3.5
Xinhu Rainrock RockOA API rockfun.php cross site scripting
A weakness has been identified in Xinhu Rainrock RockOA up to 2.7.1. Affected by this vulnerability is an unknown functionality of the file rockfun.php of the component API. This manipulation of the argument callback causes cross site scripting. The attack ma…
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Low 3.5
Xinhu Rainrock RockOA Cover Image rock_page_gong.php cross site scripting
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Low 3.5
SourceCodester API Key Manager App Import Key cross site scripting
A vulnerability was found in SourceCodester API Key Manager App 1.0. Affected by this vulnerability is an unknown functionality of the component Import Key Handler. Performing a manipulation results in cross site scripting. The attack can be initiated remotel…
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Low 3.1
zhanglun lettura RSS ContentRender.tsx cross site scripting
A vulnerability was detected in zhanglun lettura up to 0.1.22. This issue affects some unknown processing of the file src/components/ArticleView/ContentRender.tsx of the component RSS Handler. The manipulation results in cross site scripting. The attack can b…
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Low 2.4
xnx3 wangmarket Backend Variable Search variableList.do variableList cross site scripting
A weakness has been identified in xnx3 wangmarket up to 4.9. This affects the function variableList of the file /admin/system/variableList.do of the component Backend Variable Search. Executing a manipulation of the argument Description can lead to cross site…
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Low 2.4
xnx3 wangmarket System Variables variableSave.do cross site scripting
A security flaw has been discovered in xnx3 wangmarket up to 4.9. Affected by this issue is some unknown functionality of the file /admin/system/variableSave.do of the component System Variables Page. Performing a manipulation of the argument Description resu…
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Low 3.5
LigeroSmart Environment Variable cross site scripting
A vulnerability was found in LigeroSmart up to 6.1.24. This affects an unknown part of the component Environment Variable Handler. Performing a manipulation of the argument REQUEST_URI results in cross site scripting. The attack may be initiated remotely. The…
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Low 2.4
xnx3 wangmarket Add Global Variable save.do cross site scripting
A vulnerability was found in xnx3 wangmarket up to 6.4. This affects an unknown function of the file /siteVar/save.do of the component Add Global Variable Handler. The manipulation of the argument Remark/Variable Value results in cross site scripting. The att…
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Low 3.5
elinicksic Razgover Chat Message send.php cross site scripting
A security vulnerability has been detected in elinicksic Razgover up to db37dfc5c82f023a40f2f7834ded6633fb2b5262. This affects an unknown part of the file Chattify/send.php of the component Chat Message Handler. Such manipulation of the argument msg leads to …
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Low 3.5
EyouCMS Ask Module Ask.php cross site scripting
A vulnerability was detected in EyouCMS up to 1.7.7. The affected element is an unknown function of the file application/home/model/Ask.php of the component Ask Module. Performing a manipulation of the argument content results in cross site scripting. The att…
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Low 2.4
youlaitech vue3-element-admin Notice index.vue cross site scripting
A weakness has been identified in youlaitech vue3-element-admin up to 3.4.0. This issue affects some unknown processing of the file src/views/system/notice/index.vue of the component Notice Handler. This manipulation causes cross site scripting. It is possibl…
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Low 3.5
zhujunliang3 work_platform Content cross site scripting
A weakness has been identified in zhujunliang3 work_platform up to 6bc5a50bb527ce27f7906d11ea6ec139beb79c31. This vulnerability affects unknown code of the component Content Handler. Executing manipulation can lead to cross site scripting. The attack may be p…
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Low 3.5
sunhailin12315 product-review 商品评价系统 Write a Review cross site scripting
A security flaw has been discovered in sunhailin12315 product-review 商品评价系统 up to 91ead6890b4065bb45b7602d0d73348e75cb4639. This affects an unknown part of the component Write a Review. Performing manipulation of the argument content results in cross site scr…
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Low 3.5
SohuTV CacheCloud AppDataMigrateController.java index cross site scripting
A flaw has been found in SohuTV CacheCloud up to 3.2.0. This vulnerability affects the function index of the file src/main/java/com/sohu/cache/web/controller/AppDataMigrateController.java. This manipulation causes cross site scripting. Remote exploitation of …
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Low 3.5
SohuTV CacheCloud MachineManageController.java doPodList cross site scripting
A security vulnerability has been detected in SohuTV CacheCloud up to 3.2.0. Affected by this issue is the function doMachineList/doPodList of the file src/main/java/com/sohu/cache/web/controller/MachineManageController.java. The manipulation leads to cross s…