Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Grav CMS (Packagist getgrav/grav) versions before 1.8.0-beta.27 are affected. An authenticated user who has admin panel access and permission to create or edit pages can enable Twig processing in page frontmatter and inject Twig expressions that call internal APIs, allowing them to escalate to super admin or run arbitrary system commands through the scheduler. Upgrade to 1.8.0-beta.27 or later, which is the listed fixed version.
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 |
|---|---|---|---|---|
| 7.4 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0084, the 58th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:02 UTC First seen by agentprime
- 31 Oct 2026, 14:02 UTC Confirmed by OSV