CVE-2026-61812
MEDIUM
MEDIUM
Priority: 0.02
BB Relevance:
73/100
Published: 2026-11-09
Modified: 2026-11-13
First seen: 2026-11-09
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
X
AT:
Present
VC:
None
VI:
Low
VA:
None
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.
Weakness Classification (2)
Affected Software (4)
| Vendor | Product | Version |
|---|---|---|
| owasp-modsecurity | ModSecurity | < 2.9.15 |
| owasp-modsecurity | ModSecurity | >= 3.0.0, < 3.0.17 |
| owasp-modsecurity | ModSecurity | < 2.9.15 |
| owasp-modsecurity | ModSecurity | >= 3.0.0, < 3.0.17 |
References & Advisories (5)
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_MISC
x_refsource_CONFIRM