Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apache James server (org.apache.james:james-server, Maven) versions before 3.7.5 and from 3.8.0 before 3.8.1 expose a JMX endpoint that deserializes untrusted data before authentication. The source says the endpoint is bound to localhost by default, so an attacker would need local access, and a deserialization gadget could be used in an exploit chain to escalate privileges. Upgrade to version 3.7.5 or 3.8.1, 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 |
|---|---|---|---|---|
| 9.8 | Critical | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.012, the 68th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:13 UTC First seen by agentprime
- 31 Oct 2026, 15:13 UTC Confirmed by OSV