Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Concrete CMS (concrete5/core) versions below 8.5.7 are affected. An attacker with admin access who can upload files can bypass the File Manager's remote file upload restriction, stage files with disallowed extensions in the public directory, and potentially execute them as remote code, depending on server configuration. Upgrade to version 8.5.7.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.2 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.032, the 88th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:31 UTC First seen by agentprime
- 31 Oct 2026, 14:31 UTC Confirmed by OSV