Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Grav core versions before 2.0.15 are affected, with the fix in 2.0.15. The bare-function branch of the dynamic-data validation in Blueprint uses only a denylist, and the reporter says error_log is missing from it, so a crafted blueprint directive can make Grav call error_log to append attacker-chosen content to an attacker-chosen file. An attacker with a page-edit or blueprint-configuration account, but not shell access, could use this to write a file that leads to code execution, according to the source's reproduction. Upgrade to Grav 2.0.15 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 |
|---|---|---|---|---|
| 9.3 | Critical | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0086, the 58th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:55 UTC First seen by agentprime
- 31 Oct 2026, 13:55 UTC Confirmed by OSV