File deletion via inverted CSRF token check
Published May 21, 2026 · Updated May 21, 2026
Cross-site request forgery in Concrete CMS 9.5.0 and earlier allows remote attackers to delete files through a crafted web request. The DeleteFile controller rejects valid CSRF tokens but continues to deletion when the token is invalid or absent, reversing the intended request-validation gate. Exploitation requires a logged-in user with permission to edit conversation messages to submit the attacker's request; the resulting action deletes a CMS-managed file.
Summary
What happened
Cross-site request forgery in Concrete CMS 9.5.0 and earlier allows remote attackers to delete files through a crafted web request. The DeleteFile controller rejects valid CSRF tokens but continues to deletion when the token is invalid or absent, reversing the intended request-validation gate. Exploitation requires a logged-in user with permission to edit conversation messages to submit the attacker's request; the resulting action deletes a CMS-managed file.
The record
- CVE
- CVE-2026-7882
- Published
- May 21, 2026
- Updated
- May 21, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 21, 2026CVE publishedPublication date reported by the CVE source.
- May 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=5.0 <=9.5.0
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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