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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[12.1.0,12.1.7]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[12.0.0,12.0.33]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.0,11.0.28]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.0.0,10.0.28]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.4.0,9.4.60]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Eclipse Jetty", "source": "cna", "vendor": "Eclipse Foundation"}, "product": "jetty", "vendor": "eclipse"}], "analysis": {"en": {"generated_at": "2026-04-08T14:35:45.645962+00:00", "value": {"mitigation_remediation": ["Apply the latest Eclipse Jetty update that resolves the JASPIAuthenticator thread\u2011local clearance bug.", "If a patch is not yet available, upgrade to a Jetty version that does not include the vulnerable JASPIAuthenticator implementation.", "Implement monitoring to detect unexpected privilege escalation events and review server logs for anomalous access patterns.", "Consider configuring the server to use a dedicated thread pool that limits the reuse of worker threads for sequential requests."], "summary": {"action": "Immediate Patch", "impact": "Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Any installation of the Eclipse Jetty web server that includes the JASPIAuthenticator component is potentially vulnerable. Specific product and version details are not listed in the advisory, so all supported Jetty releases should be verified for the presence of the issue.", "description_and_impact": "The flaw occurs in Eclipse Jetty\u2019s JASPIAuthenticator class, where thread-local variables used for authentication checks are not cleared when an early return happens. As a result, a subsequent request handled by the same thread inherits stale authentication data, effectively bypassing access controls and allowing an attacker to execute actions with elevated privileges. This represents an authentication bypass and broken access control weakness.", "risk_and_exploitability": "The advisory assigns a CVSS base score of 7.4, indicating a high impact vulnerability. The EPSS score is not available, and the vulnerability is not listed in the CISA KEV catalog. The attack vector is inferred as remote, relying on HTTP requests sent to the server; an attacker must be able to send multiple requests that are processed on the same worker thread to exploit the thread\u2011local residue."}}}}, "created": "2026-04-08T19:27:01.097050+00:00", "title": "ThreadLocal Variable Leak Allows Thread-Based Privilege Escalation in Eclipse Jetty JASPIAuthenticator", "updated": "2026-04-08T19:39:30.618397+00:00", "vendors": ["eclipse", "eclipse$PRODUCT$jetty"]}