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
16 results · Clear filters · Feed
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Low 3.5CVE-2026-120218 Public exploit
Typemill SvgSanitizer.php saveImage cross site scripting
A flaw has been found in Typemill up to 2.26.0. The impacted element is the function ControllerApiImage::saveImage of the file system/typemill/Models/SvgSanitizer.php. Executing a manipulation can lead to cross site scripting. The attack may be performed from…
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Low 3.5CVE-2026-116004 Public exploit
onyx-dot-app Onyx PreviewTab.tsx cross site scripting
A security vulnerability has been detected in onyx-dot-app Onyx up to 5.0.0. Impacted is an unknown function of the file web/src/app/craft/components/output-panel/PreviewTab.tsx. The manipulation leads to cross site scripting. The attack can be initiated remo…
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Low 3.5CVE-2026-105950 Public exploit
getformwork URI Sanitizer DomSanitizer.php sanitizeNodeAttribute cross site scripting
A security vulnerability has been detected in getformwork formwork up to 2.3.12. Impacted is the function DomSanitizer::sanitizeNodeAttribute of the file formwork/src/Sanitizer/DomSanitizer.php of the component URI Sanitizer. Such manipulation of the argument…
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Low 3.5CVE-2026-7222 Public exploit
code-projects Coaching Management System Complaint Form complaint.php cross site scripting
A vulnerability was determined in code-projects Coaching Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /cims/modules/student/complaint.php of the component Complaint Form Page. This manipulation of the argument …
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Low 2.4CVE-2026-6184 Public exploit
code-projects Simple Content Management System welcome.php cross site scripting
A weakness has been identified in code-projects Simple Content Management System 1.0. This affects an unknown part of the file /web/admin/welcome.php. Executing a manipulation of the argument News Title can lead to cross site scripting. The attack can be exec…
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Low 3.5CVE-2026-3171 Public exploit
SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System queue.php cross site scripting
A flaw has been found in SourceCodester/Patrick Mvuma Patients Waiting Area Queue Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /queue.php. This manipulation of the argument firstname/lastname causes cross site …
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Low 2.4CVE-2026-2222 Public exploit
code-projects Online Reviewer System btn_functions.php cross site scripting
A weakness has been identified in code-projects Online Reviewer System 1.0. Affected by this vulnerability is an unknown functionality of the file /system/system/admins/manage/users/btn_functions.php. Executing a manipulation of the argument firstname can lea…
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Low 3.5CVE-2025-14221 Public exploit
SourceCodester Online Banking System page cross site scripting
A vulnerability was detected in SourceCodester Online Banking System 1.0. This impacts an unknown function of the file /?page=user. The manipulation of the argument First Name/Last Name results in cross site scripting. The attack can be launched remotely. The…
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Low 3.5CVE-2025-10370 Public exploit
MiczFlor RPi-Jukebox-RFID userScripts.php cross site scripting
A vulnerability was identified in MiczFlor RPi-Jukebox-RFID up to 2.8.0. This vulnerability affects unknown code of the file /htdocs/userScripts.php. The manipulation of the argument Custom script leads to cross site scripting. The attack is possible to be ca…
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Low 2.4CVE-2025-8550 Public exploit
atjiu pybbs list cross site scripting
A vulnerability was found in atjiu pybbs up to 6.0.0. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/topic/list. The manipulation of the argument Username leads to cross site scripting. The a…
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Low 3.5CVE-2025-8191 Public exploit
macrozheng mall Swagger UI index.html cross site scripting
A vulnerability, which was classified as problematic, was found in macrozheng mall up to 1.0.3. Affected is an unknown function of the file /swagger-ui/index.html of the component Swagger UI. The manipulation of the argument configUrl leads to cross site scri…
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Low 3.5CVE-2025-7840 Public exploit
Campcodes Online Movie Theater Seat Reservation System Reserve Your Seat Page index.php cross site scripting
A vulnerability was found in Campcodes Online Movie Theater Seat Reservation System 1.0. It has been classified as problematic. This affects an unknown part of the file /index.php?page=reserve of the component Reserve Your Seat Page. The manipulation of the a…
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Low 3.5CVE-2025-3568 Public exploit
Webkul Krayin CRM SVG File edit cross site scripting
A vulnerability has been found in Webkul Krayin CRM up to 2.1.0 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /admin/settings/users/edit/ of the component SVG File Handler. The manipulation leads to cros…
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Low 3.5CVE-2025-1337 Public exploit
Eastnets PaymentSafe BIC Search cross site scripting
A vulnerability was found in Eastnets PaymentSafe 2.5.26.0. It has been classified as problematic. This affects an unknown part of the component BIC Search. The manipulation leads to cross site scripting. It is possible to initiate the attack remotely. Upgrad…
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Low 3.5
SPA-Cart eCommerce CMS search cross site scripting
A flaw has been found in SPA-Cart eCommerce CMS 1.9.0.3. The affected element is an unknown function of the file /search. This manipulation of the argument filter[brandid]/filter[price] causes cross site scripting. The attack is possible to be carried out rem…
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Low 3.3CVE-2021-23358 Public exploit
Arbitrary Code Injection
The package underscore from 1.13.0-0 and before 1.13.0-2, from 1.3.2 and before 1.12.1 are vulnerable to Arbitrary Code Injection via the template function, particularly when a variable property is passed as an argument as it is not sanitized.