VulnerabilityAnalyzed

CVE-2026-24408

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…

MEDIUM 5.0EPSS 0.16%

Does this matter?

Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.

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 3.1: 5.0 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
EPSS: 0.16% probability · 6th percentile
CISA KEV: Not listed
Weakness: CWE-352
Affected: linuxfoundation/sigstore-python
Source: security-advisories@github.com

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.