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.

CVSS Scores

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Meta Information

Published

2026-01-26

Last Modified

2026-03-02

Generated

2026-07-07

AI Q&A

2026-01-27

EPSS Evaluated

2026-07-06

NVD

CVE-2026-24408

Affected Vendors & Products

Vendor	Product	Version / Range
linuxfoundation	sigstore-python	to 4.2.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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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