Quick answers
- Is CVE-2026-81923 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81923 being exploited in the wild.
- How severe is CVE-2026-81923?
- Low severity, with a CVSS score of 2.7, published 15 September 2026.
- Which products and versions are affected?
- Concrete CMS before 9.5.3.
- Is there a fix for CVE-2026-81923?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-81923 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-81923?
- Check whether you run Concrete CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The SEO Bulk Update Meta Tags editor in Concrete CMS before 9.5.3 fails to enforce per-page edit permissions in the saveRecord() action. While the function validates the CSRF token for the target page, it does not call canEditPageProperties() to check whether the user has edit rights. An authenticated user granted access to the bulk SEO tool can exploit this to modify meta title, meta description, and URL handle for pages they can view but not edit. The vulnerability requires the attacker to have both access to the SEO bulk tool and view permission on the target page. Patched in version 9.5.3.
Affected products
- Concrete CMS Concrete CMS before 9.5.3
Timeline
- 2026-09-15: disclosed