Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Grav versions before 2.0.0-beta.4 (the getgrav/grav Packagist package) have a flaw in the API plugin's /api/v1/blueprint-upload endpoint, which lets caller-supplied destination and scope values choose the write target. An authenticated API user with the api.media.write permission could use this to place a YAML account file in the user accounts directory and then log in as that account with super-admin API access. The fix is to upgrade to 2.0.0-beta.4 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 |
|---|---|---|---|---|
| 8.7 | 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 | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0034, the 27th 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