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CVE-2026-61812 Details

Description

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 2.9.15 and 3.0.17, t:htmlEntityDecode recognizes only a small subset of named HTML entities, so rules that depend on the transformation can inspect different bytes than a browser or backend. Attackers can encode ASCII separators and operators with unhandled entity names, including aliases, to bypass rules that depend on the transformation. The v3 decoder also accepts prefix matches instead of requiring an exact entity-token length, which can transform invalid longer names into different bytes. This issue is fixed in versions 2.9.15 and 3.0.17.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/owasp-modsecurity/ModSecurity/commit/6353be7b09ff222d29a7491c26307d293b00d56f	[email protected]
https://github.com/owasp-modsecurity/ModSecurity/commit/77be8039d734d36ec291d8fbda9e69326ae44755	[email protected]
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15	[email protected]
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17	[email protected]
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-cxqf-vgrr-xxrv	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-172	Encoding Error	[email protected]
CWE-180	Incorrect Behavior Order: Validate Before Canonicalize	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes