CVE-2026-104269: ModSecurity · Interpretation Conflict
Affects ModSecuritySource CVE Database V5
Not known to be exploited · CVSS 8.6 High : upgrade to 3.0.17 soon.
Data as of 5 Nov 2026, 16:32 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 8.6 |
|---|
- Patch
- Available – fixed in 3.0.17
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 5 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Upgrade ModSecurity to 3.0.17.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| owasp-modsecurityModSecurity | Affected
| Fixed in
|
AI-suggested
Upgrade ModSecurity to version 3.0.17 or later, where this issue is fixed. No other mitigation is required as the fix addresses the root cause of the filename parameter precedence conflict.
Description
CVE-2026-104269 is a high-severity vulnerability in ModSecurity versions 3.0.0 through 3.0.16. The multipart parser in these versions does not correctly apply RFC 2231 precedence rules for the filename* parameter in Content-Disposition headers. This discrepancy allows an attacker to supply a benign filename parameter for ModSecurity inspection while the backend application uses a different encoded filename*, potentially bypassing WAF rules that rely on filename checks. The issue is fixed in version 3.0.17.
References
- github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-5pww-8rfg-9crf (opens in a new tab)
- github.com/owasp-modsecurity/ModSecurity/commit/463db0c840fa27bfba095b0406a63004a12884b0 (opens in a new tab)
- github.com/owasp-modsecurity/ModSecurity/commit/c6bd53d2dd96766b3afdc35d9929ebb20925d13d (opens in a new tab)
- github.com/owasp-modsecurity/ModSecurity/releases/tag/v2.9.15 (opens in a new tab)
- github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.17 (opens in a new tab)