CVE-2026-61812

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.

• CWE-172
• CWE-180

• https://github.com/owasp-modsecurity/ModSecurity/commit/6353be7b09ff222d29a7491c26307d293b00d56f
• https://github.com/owasp-modsecurity/ModSecurity/commit/77be8039d734d36ec291d8fbda9e69326ae44755
• https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15
• https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17
• https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-cxqf-vgrr-xxrv

Published

Nov 9, 2026

Last Modified

Nov 13, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-61806Frappe Learning Management System (LMS) is a learning system…5.3
• CVE-2026-61807Snipe-IT is an IT asset/license management system. Prior to …6.1
• CVE-2026-61808LightRAG provides simple and fast retrieval-augmented genera…9.8
• CVE-2026-6181The Device Configuration Framework is vulnerable to an authe…5.9
• CVE-2026-61810libspdm is a sample implementation that follows the DMTF SPD…6
• CVE-2026-61811Wazuh is an open-source security platform providing unified …6.5
• CVE-2026-61813ModSecurity is an open source, cross platform web applicatio…3.7
• CVE-2026-61814Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's A…7.5
• CVE-2026-61815zbateson/mail-mime-parser is a mail mime parser alternative …7.2
• CVE-2026-61816zbateson/mail-mime-parser is a mail mime parser alternative …7.5
• CVE-2026-61817pg_partman is a PostgreSQL extension that manages partitione…8.5
• CVE-2026-61818pg_partman is a PostgreSQL extension that manages partitione…8.5