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
1,074 results · Clear filters · Feed
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Low 3.5
code-projects Online Class and Exam Scheduling System profile.php cross site scripting
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Low 2.4
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Low 2.4
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Low 2.4
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Low 2.4
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Low 2.4
FiberHome AN5506-01A ONU GPON Port Forwarding Submenu portForwardingCfg cross site scripting
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FiberHome AN5506-01A ONU GPON URL Filtering Submenu URL_filterCfg cross site scripting
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Low 3.5
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Low 3.5
SourceCodester Best Church Management Software redirect.php cross site scripting
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Low 2.4
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Low 2.4
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Low 3.5
code-projects Blood Bank System A-.php cross site scripting
A vulnerability was found in code-projects Blood Bank System 1.0. It has been declared as problematic. This vulnerability affects unknown code of the file /Blood/A-.php. The manipulation of the argument Bloodname leads to cross site scripting. The attack can …
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Low 2.4
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Low 2.4
code-projects Blood Bank System user.php cross site scripting
A vulnerability was found in code-projects Blood Bank System 1.0 and classified as problematic. This issue affects some unknown processing of the file /admin/user.php. The manipulation of the argument email leads to cross site scripting. The attack may be ini…
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Low 3.5
code-projects Blood Bank System prostatus.php cross site scripting
A vulnerability, which was classified as problematic, has been found in code-projects Blood Bank System 1.0. Affected by this issue is some unknown functionality of the file /prostatus.php. The manipulation of the argument message leads to cross site scriptin…
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Low 3.5
pankajindevops scale project cross site scripting
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Low 3.5
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Low 3.5
D-Link DIR-816 index.html cross site scripting
A vulnerability has been found in D-Link DIR-816 1.01TO and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /cgi-bin/webproc?getpage=html/index.html&var:menu=24gwlan&var:page=24G_basic. The manipulation of the…
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Low 3.5
Internet Web Solutions Sublime CRM HTTP POST Request inicio.php cross site scripting
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Low 3.5CVE-2025-1337 Public exploit
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Low 2.4
FastCMS Template Menu menu cross site scripting
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Low 3.5
pihome-shc PiHome index.php cross site scripting
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Low 3.5
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Low 3.5
code-projects Wazifa System Profile.php cross site scripting
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Low 3.5
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A vulnerability, which was classified as problematic, was found in code-projects Real Estate Property Management System 1.0. Affected is an unknown function of the file /search.php. The manipulation of the argument PropertyName leads to cross site scripting. …
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Low 3.5
code-projects Real Estate Property Management System EditCategory cross site scripting
A vulnerability, which was classified as problematic, has been found in code-projects Real Estate Property Management System 1.0. This issue affects some unknown processing of the file /Admin/EditCategory. The manipulation of the argument CategoryId leads to …
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Low 3.5
code-projects Job Recruitment load_user-profile.php cross site scripting
A vulnerability has been found in code-projects Job Recruitment 1.0 and classified as problematic. This vulnerability affects unknown code of the file /_parse/load_user-profile.php. The manipulation leads to cross site scripting. The attack can be initiated r…
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Low 2.4
1000 Projects Bookstore Management System Add Book Page process_book_add.php cross site scripting
A vulnerability has been found in 1000 Projects Bookstore Management System 1.0 and classified as problematic. This vulnerability affects unknown code of the file process_book_add.php of the component Add Book Page. The manipulation of the argument Book Name …
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Low 3.5
code-projects Real Estate Property Management System CustomerReport.php cross site scripting
A vulnerability classified as problematic was found in code-projects Real Estate Property Management System 1.0. Affected by this vulnerability is an unknown functionality of the file /Admin/CustomerReport.php. The manipulation of the argument Address leads t…
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Low 3.5
code-projects Real Estate Property Management System Category.php cross site scripting
A vulnerability classified as problematic has been found in code-projects Real Estate Property Management System 1.0. Affected is an unknown function of the file /Admin/Category.php. The manipulation of the argument Desc leads to cross site scripting. It is p…
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Low 3.5
SourceCodester Image Compressor Tool compressor.php cross site scripting
A vulnerability was found in SourceCodester Image Compressor Tool 1.0. It has been rated as problematic. This issue affects some unknown processing of the file /image-compressor/compressor.php. The manipulation of the argument image leads to cross site script…
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Low 3.5
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Low 3.5
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Low 2.3
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Low 3.5
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Low 3.5
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