CVE-2026-33691 (GCVE-0-2026-33691)
Vulnerability from cvelistv5 – Published: 2026-04-02 15:03 – Updated: 2026-04-18 19:16
VLAI
EPSS
VEX
Title
OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks
Summary
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.
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/coreruleset/coreruleset/securi… | x_refsource_CONFIRM |
| https://github.com/coreruleset/coreruleset/pull/4546 | x_refsource_MISC |
| https://github.com/coreruleset/coreruleset/pull/4547 | x_refsource_MISC |
| https://github.com/coreruleset/coreruleset/pull/4548 | x_refsource_MISC |
| https://github.com/coreruleset/coreruleset/commit… | x_refsource_MISC |
| https://github.com/coreruleset/coreruleset/releas… | x_refsource_MISC |
| https://github.com/coreruleset/coreruleset/releas… | x_refsource_MISC |
| http://www.openwall.com/lists/oss-security/2026/03/29/2 | |
| http://seclists.org/fulldisclosure/2026/Apr/0 | |
| http://www.openwall.com/lists/oss-security/2026/04/18/4 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| coreruleset | coreruleset |
Affected:
< 3.3.9
Affected: >= 4.0.0-rc1, < 4.25.0 |
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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