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Eclipse Jetty: Early return from the JASPIAuthenticator code can potentially no clear ThreadLocal variables

High severity GitHub Reviewed Published Apr 11, 2026 in jetty/jetty.project • Updated Apr 14, 2026

Package

maven org.eclipse.jetty.ee10:jetty-ee10-jaspi (Maven)

Affected versions

>= 12.1.0, <= 12.1.7
>= 12.0.0, <= 12.0.33

Patched versions

12.1.8
12.0.34
maven org.eclipse.jetty.ee11:jetty-ee11-jaspi (Maven)
>= 12.1.0, <= 12.1.7
>= 12.0.0, <= 12.0.33
12.1.8
12.0.34
maven org.eclipse.jetty.ee8:jetty-ee8-jaspi (Maven)
>= 12.1.0, <= 12.1.7
>= 12.0.0, <= 12.0.33
12.1.8
12.0.34
maven org.eclipse.jetty.ee9:jetty-ee9-jaspi (Maven)
>= 12.1.0, <= 12.1.7
>= 12.0.0, <= 12.0.33
12.1.8
12.0.34
maven org.eclipse.jetty:jetty-jaspi (Maven)
>= 11.0.0, <= 11.0.28
>= 10.0.0, <= 10.0.28
>= 9.4.0, <= 9.4.60
11.0.29
10.0.29
9.4.61

Description

Description (as reported)

A security vulnerability has been identified in Jetty's JaspiAuthenticator.java.

The root cause is a failure to consistently clear authentication metadata stored in ThreadLocal during certain error or incomplete authentication flows.
Specifically, after a GroupPrincipalCallback is persisted into the ThreadLocal, the authentication process may exit prematurely — before the ThreadLocal storage is cleared — if a mandatory CallerPrincipalCallback is missing or an exception occurs.
This allows a subsequent, unprivileged user processed by the same worker thread to inherit these residual security roles, leading to Broken Access Control and Privilege Escalation.

See also attached PDF.

Impact

An unauthenticated user may gain ungrated privileges from a previous request (privilege escalation).

Patches

No patches yet.

Workarounds

Do not use Jetty's JASPI.

References

@olamy olamy published to jetty/jetty.project Apr 11, 2026
Published to the GitHub Advisory Database Apr 14, 2026
Reviewed Apr 14, 2026
Last updated Apr 14, 2026

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(5th percentile)

Weaknesses

Sensitive Information in Resource Not Removed Before Reuse

The product releases a resource such as memory or a file so that it can be made available for reuse, but it does not clear or zeroize the information contained in the resource before the product performs a critical state transition or makes the resource available for reuse by other entities. Learn more on MITRE.

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Learn more on MITRE.

CVE ID

CVE-2026-5795

GHSA ID

GHSA-r7p8-xq5m-436c

Source code

Credits

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