CVE-2026-33691
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.
- Affected products
- Kusanagi-Mod Security Crs
- Owasp Owasp Modsecurity Core Rule Set
- < 3.3.9, 4.25.0
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 3.6% (88th percentile)
- Weakness
- CWE-178
- NVD status
- Modified
- Published
- 2026-04-02
No indexed exploits for CVE-2026-33691 yet
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