Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Grav CMS versions before 1.8.0-beta.27 are affected by a server-side template injection flaw that bypasses the Twig security sandbox. An attacker needs an account with editor permissions on a page where Twig processing is enabled; by injecting crafted template directives, they can execute arbitrary operating system commands on the server. The fix is to upgrade the getgrav/grav package to 1.8.0-beta.27 or later.
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 |
|---|---|---|---|---|
| 8.8 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0065, the 51st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:59 UTC First seen by agentprime
- 31 Oct 2026, 13:59 UTC Confirmed by OSV