Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Unity Catalog (io.unitycatalog:unitycatalog-server) versions before 0.4.1 are vulnerable. The token exchange endpoint fetches signing keys from whatever issuer is named in an incoming JWT without checking that the issuer is trusted, and it also skips audience validation. An attacker who can reach the server can sign a token with their own key, claim any known user, and obtain an internal access token that grants that user's catalog and table permissions. Upgrade to version 0.4.1 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 |
|---|---|---|---|---|
| 9.1 | Critical | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0021, the 10th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV