Authenticated code execution via serialized block fields
Published Mar 4, 2026 · Updated Mar 4, 2026
PHP object injection in Concrete CMS before 9.4.8 allows remote authenticated users to execute code through Express Entry List settings. The block controller saves attacker-controlled columns data and later passes the serialized value to unserialize() without class restrictions or integrity checks. Administrator access is required; successful exploitation runs code in the CMS server context and can compromise the hosted site.
Summary
What happened
PHP object injection in Concrete CMS before 9.4.8 allows remote authenticated users to execute code through Express Entry List settings. The block controller saves attacker-controlled columns data and later passes the serialized value to unserialize() without class restrictions or integrity checks. Administrator access is required; successful exploitation runs code in the CMS server context and can compromise the hosted site.
The record
- CVE
- CVE-2026-3452
- Published
- Mar 4, 2026
- Updated
- Mar 4, 2026
- Vendor
- Concrete CMS
- Product
- Concrete CMS
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 4, 2026CVE publishedPublication date reported by the CVE source.
- Mar 4, 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 <9.4.8
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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