Site configuration changes via missing CSRF validation
Published Sep 15, 2026 · Updated Sep 15, 2026
CSRF in theme page-template activation in Concrete CMS before 9.5.3 allows remote attackers to change site configuration. The Dashboard theme Inspect controller's activate_files() action creates PageTemplate records from attacker-supplied pageTemplates[] values without validating an anti-CSRF token. Exploitation requires a signed-in administrator to visit attacker-controlled content that submits the forged request under the administrator's session.
Summary
What happened
CSRF in theme page-template activation in Concrete CMS before 9.5.3 allows remote attackers to change site configuration. The Dashboard theme Inspect controller's activate_files() action creates PageTemplate records from attacker-supplied pageTemplates[] values without validating an anti-CSRF token. Exploitation requires a signed-in administrator to visit attacker-controlled content that submits the forged request under the administrator's session.
The record
- CVE
- CVE-2026-81924
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-352
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 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=5.0.0 <=9.5.2
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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