CWE-692
Incomplete Denylist to Cross-Site Scripting
The product uses a denylist-based protection mechanism to defend against XSS attacks, but the denylist is incomplete, allowing XSS variants to succeed.
CVE-2023-26047 (GCVE-0-2023-26047)
Vulnerability from cvelistv5
Published
2023-03-03 22:44
Modified
2025-02-25 15:02
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
teler-waf is a Go HTTP middleware that provides teler IDS functionality to protect against web-based attacks. In teler-waf prior to version v0.2.0 is vulnerable to a bypass attack when a specific case-sensitive hex entities payload with special characters such as CR/LF and horizontal tab is used. This vulnerability allows an attacker to execute arbitrary JavaScript code on the victim's browser and compromise the security of the web application. An attacker can exploit this vulnerability to bypass common web attack threat rules in teler-waf and launch cross-site scripting (XSS) attacks. The attacker can execute arbitrary JavaScript code on the victim's browser and steal sensitive information, such as login credentials and session tokens, or take control of the victim's browser and perform malicious actions. This issue has been patched in version 0.2.0.
References
| ► | URL | Tags |
|---|---|---|
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CVE-2024-52305 (GCVE-0-2024-52305)
Vulnerability from cvelistv5
Published
2024-11-13 15:20
Modified
2024-11-13 19:25
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
UnoPim is an open-source Product Information Management (PIM) system built on the Laravel framework. A vulnerability exists in the Create User process, allowing the creation of a new admin account with an option to upload a profile image. An attacker can upload a malicious SVG file containing an embedded script. When the profile image is accessed, the embedded script executes, leading to the potential theft of session cookies. This vulnerability is fixed in 0.1.5.
References
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|---|---|---|---|---|---|---|---|---|
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CVE-2025-49590 (GCVE-0-2025-49590)
Vulnerability from cvelistv5
Published
2025-06-18 22:14
Modified
2025-06-23 16:41
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-692 - Incomplete Denylist to Cross-Site Scripting
Summary
CryptPad is a collaboration suite. Prior to version 2025.3.0, the "Link Bouncer" functionality attempts to filter javascript URIs to prevent Cross-Site Scripting (XSS), however this can be bypassed. There is an "early allow" code path that happens before the URI's protocol/scheme is checked, which a maliciously crafted URI can follow. This issue has been patched in version 2025.3.0.
References
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CVE-2025-53904 (GCVE-0-2025-53904)
Vulnerability from cvelistv5
Published
2025-07-16 17:02
Modified
2025-07-18 14:27
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
The Scratch Channel is a news website that is under development as of time of this writing. The file `/api/admin.js` contains code that could make the website vulnerable to cross-site scripting. No known patches exist as of time of publication.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| The-Scratch-Channel | the-scratch-channel.github.io |
Version: <= b66a1cae45e05ad8971aecd96c3322520f8a5725 |
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No mitigation information available for this CWE.
CAPEC-120: Double Encoding
The adversary utilizes a repeating of the encoding process for a set of characters (that is, character encoding a character encoding of a character) to obfuscate the payload of a particular request. This may allow the adversary to bypass filters that attempt to detect illegal characters or strings, such as those that might be used in traversal or injection attacks. Filters may be able to catch illegal encoded strings, but may not catch doubly encoded strings. For example, a dot (.), often used in path traversal attacks and therefore often blocked by filters, could be URL encoded as %2E. However, many filters recognize this encoding and would still block the request. In a double encoding, the % in the above URL encoding would be encoded again as %25, resulting in %252E which some filters might not catch, but which could still be interpreted as a dot (.) by interpreters on the target.
CAPEC-267: Leverage Alternate Encoding
An adversary leverages the possibility to encode potentially harmful input or content used by applications such that the applications are ineffective at validating this encoding standard.
CAPEC-71: Using Unicode Encoding to Bypass Validation Logic
An attacker may provide a Unicode string to a system component that is not Unicode aware and use that to circumvent the filter or cause the classifying mechanism to fail to properly understanding the request. That may allow the attacker to slip malicious data past the content filter and/or possibly cause the application to route the request incorrectly.
CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic
This attack is a specific variation on leveraging alternate encodings to bypass validation logic. This attack leverages the possibility to encode potentially harmful input in UTF-8 and submit it to applications not expecting or effective at validating this encoding standard making input filtering difficult. UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. Legal UTF-8 characters are one to four bytes long. However, early version of the UTF-8 specification got some entries wrong (in some cases it permitted overlong characters). UTF-8 encoders are supposed to use the "shortest possible" encoding, but naive decoders may accept encodings that are longer than necessary. According to the RFC 3629, a particularly subtle form of this attack can be carried out against a parser which performs security-critical validity checks against the UTF-8 encoded form of its input, but interprets certain illegal octet sequences as characters.
CAPEC-85: AJAX Footprinting
This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.