CVE-2026-19864 Eclipse Jetty's `SessionAuthentication` retains authentication credentials in a serializable object.
Attackers with read access to persisted session data can obtain plaintext passwords of authenticated users in Eclipse Jetty.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-19864?
CVE-2026-19864 is a medium-severity vulnerability, published on 15 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Eclipse Jetty's `SessionAuthentication` retains authentication credentials in a serializable object. When the credentials contain a plaintext password and the authenticated session is persisted to a session data store, the password may consequently be written to persistent storage in plaintext.
An attacker with sufficient privileges to read the persisted session data may obtain the plaintext passwords of authenticated users.
Weakness: CWE-312
Which versions are affected by CVE-2026-19864?
How do I fix CVE-2026-19864?
Apply the vendor's patch.
Is CVE-2026-19864 being exploited?
There is no known exploitation of CVE-2026-19864 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-19864, GHSA-q6wx-j9wr-fj7f, UBUNTU-CVE-2026-19864.