CVE-2026-19864 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Eclipse Jetty deployments, especially those using authentication, should assess exposure and prioritize mitigation to prevent potential unauthorized access to sensitive information. This includes operators, platform administrators, vulnerability management teams, and security teams that need to verify and mitigate this vulnerability.

Why it matters

CVE-2026-19864 is a medium-severity vulnerability in Eclipse Jetty's SessionAuthentication, potentially allowing attackers to obtain plaintext passwords from persisted session data. Defenders should prioritize verification, mitigation, and updates to secure authentication practices.

• Potential unauthorized access to sensitive information
• Need for verification of affected versions and configurations
• Possible data breaches due to plaintext password storage
• Required updates to secure authentication and session management practices

Technical summary

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.

Defensive priority

Defenders should prioritize verifying and mitigating this vulnerability, especially in systems using Eclipse Jetty for authentication.

Recommended defensive actions

• Verify and update Eclipse Jetty versions to the latest
• Implement additional security measures for authentication and session management
• Monitor systems for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information from vendor sources may be necessary for comprehensive mitigation. Affected systems may have plaintext passwords stored in persistent storage due to the serialization of authentication credentials. Defenders should verify the presence of affected versions and configurations, and review compensating controls for exposed systems while remediation is scheduled and verified.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.