sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. `_OAuthSession` creates a unique "state" and sends it as a parameter in the authentication request but the "state" in the server response seems not not be cross-checked with this value. Version 4.2.0 contains a patch for the issue.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-hm8f-75xx-w2vr sigstore CSRF possibility in OIDC authentication during signing
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 27 Jan 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 27 Jan 2026 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Sigstore
Sigstore sigstore-python
Vendors & Products Sigstore
Sigstore sigstore-python

Mon, 26 Jan 2026 22:30:00 +0000

Type Values Removed Values Added
Description sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. `_OAuthSession` creates a unique "state" and sends it as a parameter in the authentication request but the "state" in the server response seems not not be cross-checked with this value. Version 4.2.0 contains a patch for the issue.
Title sigstore has CSRF possibility in OIDC authentication during signing
Weaknesses CWE-352
References
Metrics cvssV3_1

{'score': 0, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-27T21:35:14.119Z

Reserved: 2026-01-22T18:19:49.174Z

Link: CVE-2026-24408

cve-icon Vulnrichment

Updated: 2026-01-27T21:35:10.160Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-26T23:16:08.973

Modified: 2026-01-27T14:59:34.073

Link: CVE-2026-24408

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-27T09:03:17Z

Weaknesses