Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
ApostropheCMS (npm package apostrophe) versions before 4.33.0 contain an authorization bypass in the exist-in-locale API, which does not apply document-level view or edit permission checks. An authenticated low-privilege user can send requests to this endpoint to learn whether restricted documents exist in a given locale and mode, including drafts, and obtain their localized identifiers, though not document content. Upgrade to apostrophe 4.33.0 or later, which contains the fix.
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 |
|---|---|---|---|---|
| 4.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0036, the 30th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:33 UTC First seen by agentprime
- 31 Oct 2026, 13:33 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-vmxh-77cw-65j7
- OSV: GHSA-vmxh-77cw-65j7
- github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmxh-77cw-65j7
- github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce
- github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350
- github.com/apostrophecms/apostrophe
- github.com/apostrophecms/apostrophe/releases/tag/[email protected]