CVE-2026-40161Network attack vector

Shared Git API token disclosure via unvalidated serverURL

Published Apr 21, 2026 · Updated Apr 21, 2026

Information disclosure in affected Tekton Pipelines 1.x releases allows remote authenticated users to steal the system Git API token. ResolveAPIGit accepts an unvalidated serverURL, obtains the configured token when token is omitted, and attaches it to requests sent to that URL. TaskRun or PipelineRun creation, API mode, an omitted token parameter, and a configured shared token are required; the exposed token typically reads private repositories.

CVSS severity7.7
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Tekton Pipelines 1.x releases allows remote authenticated users to steal the system Git API token. ResolveAPIGit accepts an unvalidated serverURL, obtains the configured token when token is omitted, and attaches it to requests sent to that URL. TaskRun or PipelineRun creation, API mode, an omitted token parameter, and a configured shared token are required; the exposed token typically reads private repositories.

The record

CVE
CVE-2026-40161
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Tekton
Product
Tekton Pipelines
Classifications
CWE-201, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.0.0, <= 1.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tekton · Tekton Pipelinesversion=>= 1.0.0, <= 1.10.0

Published CVSS scores

7.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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