Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Actual Sync Server versions before 26.7.0 (npm package @actual-app/sync-server) have a flaw in the CORS proxy's GitHub API allowlist check, which uses a prefix match without a path boundary. When the server's GitHub token is configured and the proxy is enabled, any authenticated Actual user can reach private repositories whose names start with an allowlisted plugin repository name, such as acme/plugin-private for acme/plugin, and read their contents through the server's token. Upgrade to version 26.7.0 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 |
|---|---|---|---|---|
| 7.1 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0026, the 17th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:34 UTC First seen by agentprime
- 31 Oct 2026, 13:34 UTC Confirmed by OSV