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Vulnerability Details 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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.001

EPSS Ranking 16.9%

CVSS Severity

CVSS v3 Score 6.8

References

Products affected by CVE-2026-33691

Owasp » Owasp Modsecurity Core Rule Set » Version: Any

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*
Owasp » Owasp Modsecurity Core Rule Set » Version: 2.2.5

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:2.2.5
Owasp » Owasp Modsecurity Core Rule Set » Version: 2.2.6

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:2.2.6
Owasp » Owasp Modsecurity Core Rule Set » Version: 2.2.7

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:2.2.7
Owasp » Owasp Modsecurity Core Rule Set » Version: 2.2.8

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:2.2.8
Owasp » Owasp Modsecurity Core Rule Set » Version: 2.2.9

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:2.2.9
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.0.0

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.0.0
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.0.1

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.0.1
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.0.2

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.0.2
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.1.0

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.1.0
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.1.1

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.1.1
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.1.2

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.1.2
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.2.0

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.2.0
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.2.1

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.2.1
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.3.0

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.3.0
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.3.1

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.3.1
Owasp » Owasp Modsecurity Core Rule Set » Version: 3.3.2

cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:3.3.2

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Vulnerability Details CVE-2026-33691

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