CVEvulnerability

CVE-2026-33691

7.5 HIGH Published 2026-04-02 Modified 2026-07-24 Official page ↗
Status
Modified
Published
2026-04-02
Last modified
2026-07-24
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-178

Description

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 configurations

• owasp owasp modsecurity core rule set (< 3.3.9) • owasp owasp modsecurity core rule set (>= 4.0.0 < 4.25.0)

Related

Weakness · CWE (1)

  • CWE-178 Improper Handling of Case Sensitivity weakness

References