CVE-2026-24408

Name: CVE-2026-24408
Creator: NVD / NIST
Published: 2026-01-26T23:16:08.973+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2026-24408 is a medium-severity vulnerability rated 5/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5/10

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

EPSS Probability

0.16%

5.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Linuxfoundation	Sigstore-Python	< 4.2.0

References

https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aaPatch
https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0Product, Release Notes
https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vrVendor Advisory

Timeline

Published: Jan 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-24408?

How severe is CVE-2026-24408?

CVE-2026-24408 has a CVSS score of 5/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-24408?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-24408?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST