CVE-2026-33691 | BDVDB-2026-324405 Detail

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.

Impact#

Weaknesses#

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Exploit#

History#

1. Version 12026-04-02Record published in the CVE List.
2. Version 22026-04-18Most recent update recorded in the CVE List.