Vulnerability Report

CVE-2026-40161

Title: Git Token Exfiltration in Tekton Pipelines

Information Disclosure

Proof Of Concept

No public PoC currently indexed for CVE-2026-40161.

CWE Category CWE-201

Published Date Apr 21, 2026

Modified Date May 21, 2026

Exploit Status Not Found

Score 7.7 CVSS v3.1

Exploit Probability (EPSS)

0.04%

Vulnerability Summary

CVE-2026-40161: Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the Tekton Pipelines git resolver in API mode sends the system-configured Git API token to a user-controlled serverURL when the user omits the token parameter. A tenant with TaskRun or PipelineRun create permission can exfiltrate the shared API token (GitHub PAT, GitLab token, etc.) by pointing serverURL to an attacker-controlled endpoint. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Impacted Vendors

linuxfoundation 1

Reference Links

https://github.com/tektoncd/pipeline/issues/9608 https://github.com/tektoncd/pipeline/issues/9609 https://github.com/tektoncd/pipeline/security/advisories/GHSA-wjxp-xrpv-xpff

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N