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.
INFO
Published Date :
2026-04-02T15:03:52.126Z
Last Modified :
2026-04-02T17:38:10.247Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-33691 vulnerability.
| Vendors | Products |
|---|---|
| Coreruleset |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33691.
