| CVE ID | CVE-2026-11860 |
| Publication date | 15 June 2026 |
| Vendor | OpenSolution |
| Product | Quick.CMS |
| Vulnerable versions | All through 6.8 until patch published on 14.05.2026 |
| Vulnerability type (CWE) | Deserialization of Untrusted Data (CWE-502) |
| Report source | Report to CERT Polska |
Description
CERT Polska has received a report about vulnerability in OpenSolution Quick.CMS software and participated in coordination of its disclosure.
The vulnerability CVE-2026-11860: Quick.CMS deserializes user-controlled data received over plaintext HTTP without ensuring integrity or authenticity. This allows attackers to tamper with serialized payloads in transit and inject malicious objects. Because deserialization is performed without proper validation or class restrictions, crafted payloads can trigger dangerous magic methods (e.g., __wakeup() and __destruct()) and leverage gadget chains, resulting in arbitrary code execution. Exploitation is triggered automatically when an administrator accesses the admin panel.
When successfully exploited, this vulnerability allows attackers to execute arbitrary code on the server via manipulated serialized data transmitted over an unprotected channel.
This issue was mitigated by limiting the communication to HTTPS in a patch for version 6.8 published on 14.05.2026, deployments without this patch remain vulnerable.
Credits
We thank Arkadiusz Marta for the responsible vulnerability report.
More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.