CVE-2026-24408
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-26

Last updated on: 2026-03-02

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-01-26
Last Modified
2026-03-02
Generated
2026-06-16
AI Q&A
2026-01-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24408
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linuxfoundation sigstore-python to 4.2.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-352 The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
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Executive Summary

This vulnerability in sigstore-python versions prior to 4.2.0 involves the OAuth authentication flow being susceptible to Cross-Site Request Forgery (CSRF). Although the tool creates a unique "state" parameter during authentication requests, it does not properly verify that the "state" returned by the server matches the original, allowing an attacker to potentially perform unauthorized actions by exploiting this flaw.

Impact Analysis

The vulnerability could allow an attacker to perform unauthorized actions on behalf of a user by exploiting the CSRF weakness in the OAuth authentication flow. This could lead to security risks such as unauthorized access or manipulation of signature verification processes within sigstore-python.

Mitigation Strategies

Upgrade sigstore-python to version 4.2.0 or later, as this version contains a patch that fixes the Cross-Site Request Forgery vulnerability in the OAuth authentication flow.

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