Configuration disclosure via unauthorized sub-block asset registration
Published Sep 8, 2026 · Updated Sep 10, 2026
Missing authorization in Concrete CMS before 9.5.3 allows remote attackers to read restricted sub-block configuration via public pages. Stack, Container, and layout-area rendering registers view assets and invokes asset or header hooks for every sub-block without first checking its view permission. Exploitation requires a public page embedding an affected composite area and a restricted sub-block whose hooks emit configuration, exposing values such as a Google Maps API key without authentication.
Summary
What happened
Missing authorization in Concrete CMS before 9.5.3 allows remote attackers to read restricted sub-block configuration via public pages. Stack, Container, and layout-area rendering registers view assets and invokes asset or header hooks for every sub-block without first checking its view permission. Exploitation requires a public page embedding an affected composite area and a restricted sub-block whose hooks emit configuration, exposing values such as a Google Maps API key without authentication.
The record
- CVE
- CVE-2026-81904
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-862, CAPEC-1, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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 <=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
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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