Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Coder (Go module github.com/coder/coder/v2) versions before 2.29.17, from 2.30.0 before 2.32.7, from 2.33.0 before 2.33.8, and from 2.34.0 before 2.34.2 are vulnerable. With subdomain app routing enabled, an authenticated user can craft a workspace app URL that bypasses the same-owner CORS check, so if a victim visits it while logged in, the attacker can read responses from the victim's workspace apps. Upgrade to 2.29.17, 2.32.7, 2.33.8, 2.34.2, or later. No workaround is listed.
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 |
|---|---|---|---|---|
| 5.8 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0022, the 12th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:05 UTC First seen by agentprime
- 31 Oct 2026, 15:05 UTC Confirmed by OSV