Log deletion via missing CSRF validation
Published May 21, 2026 · Updated May 21, 2026
Cross-site request forgery in Concrete CMS 9.0 through 9.5.0 allows remote attackers to delete application log entries. The concrete/controllers/dialog/logs/delete controller accepts a state-changing request without sufficient proof that the authenticated user intended it. Exploitation requires an authenticated user with log-management permission to load attacker-controlled content; the bounded impact is deletion of application logs.
Summary
What happened
Cross-site request forgery in Concrete CMS 9.0 through 9.5.0 allows remote attackers to delete application log entries. The concrete/controllers/dialog/logs/delete controller accepts a state-changing request without sufficient proof that the authenticated user intended it. Exploitation requires an authenticated user with log-management permission to load attacker-controlled content; the bounded impact is deletion of application logs.
The record
- CVE
- CVE-2026-8409
- Published
- May 21, 2026
- Updated
- May 21, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-352, CWE-1275, T1070
- 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
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=9.0 <=9.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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