A HIGH-severity vulnerability identified as CVE-2026-10721 has been published on June 10, 2026 with a CVSS base score of 8.4. This security advisory provides a detailed breakdown of the vulnerability, its potential impact, weakness classification, and actionable steps to protect your systems.
Vulnerability Details
CVE ID: CVE-2026-10721
Severity: HIGH
CVSS Score: 8.4
Published: June 10, 2026
Weakness (CWE): CWE-502
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | High |
| User Interaction | None |
Technical Description
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the in Permission, Cache, and Search components. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 for reporting.
Potential Impact
If exploited, this high-severity vulnerability could allow an attacker to cause significant damage to affected systems. Organizations running affected software should treat this as a priority remediation item.
Recommended Action
No official patch is available yet. Until one is released:
- Monitor the official NVD page and vendor channels for patch announcements.
- Restrict access to the affected system or service where possible.
- Apply network-level mitigations such as firewall rules or WAF policies.
- Enable logging and alerting for anomalous activity related to this vulnerability.
- Review your incident response plan in case of active exploitation.
References
Related Security Advisories
- [HIGH] CVE-2026-7584 — CVSS 7.8 (May 1, 2026) — HIGH / CVSS 7.8
- [HIGH] CVE-2026-6023 — CVSS 8.1 (April 22, 2026) — HIGH / CVSS 8.1
- [HIGH] CVE-2026-11498 — CVSS 8.8 (June 8, 2026) — HIGH / CVSS 8.8
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