CVE-2026-68531 Denial of service in Concrete CMS
Authenticated users can cause denial of service in Concrete CMS by submitting crafted search queries with unescaped SQL wildcards, forcing expensive database scans.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-68531?
CVE-2026-68531 is a low-severity denial of service vulnerability in Concrete CMS, published on 15 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Concrete CMS 9 before 9.5.3 did not escape SQL LIKE wildcard characters in the keyword search filters used by the file manager, file folders, and page list, allowing an authenticated user with editor-level or higher privileges to submit a crafted search containing many single-character wildcards. Because the keyword input was placed into the LIKE clause without neutralizing its wildcard metacharacters, a short request could force the database to evaluate every row and perform a full-table scan, and repeated or wildcard-dense searches could sustain elevated database CPU and I/O, degrading responsiveness for other users on large installations. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N. Thanks noivan for reporting.
Weakness: CWE-405
Which versions are affected by CVE-2026-68531?
How do I fix CVE-2026-68531?
No fix has been published for CVE-2026-68531 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-68531 being exploited?
There is no known exploitation of CVE-2026-68531 in the wild and no public exploit code.
Sources
Also known as GHSA-mcfm-6jvw-6qf6.