CVE WatchNov 5, 2026

CVE-2026-73856

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 until 3.0.17, src/

CVSS

8.6

High

EPSS

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KEV

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Exploit Today

0-100

Published: Nov 5, 2026 · Last modified: Nov 5, 2026 · CWE-178

EPSS · 30d

Not enough EPSS history yet.

Technical description

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 until 3.0.17, src/transaction.cc compares a response Content-Type value against SecResponseBodyMimeType entries case-sensitively. A mixed-case response media type that is semantically equivalent to a configured lowercase type can therefore be treated as unconfigured, causing ModSecurity to skip RESPONSE_BODY inspection. An unauthenticated requester can then receive response content that a phase 4 rule would otherwise block, including sensitive error or debug data. This issue is fixed in version 3.0.17.

Official references

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CVECVSSEPSSKEVRExploitTitleMod.

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