5

CVE-2026-24408: linuxfoundation sigstore-python Cross-Site Request Forgery (CSRF)

CVSS: 5.0v3.1MediumAnalyzed
AliasesGHSA-hm8f-75xx-w2vrPYSEC-2026-1924openSUSE-SU-2026:10104-1
Published 26-01-2026Last modified 27-01-2026
Open JSON

Vulnerability summary

CVE-2026-24408 is a medium (CVSS 5.0) Cross-Site Request Forgery (CSRF) vulnerability in linuxfoundation sigstore-python. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
5.0/10
010
Medium · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-01-2026
    PublishedVulnerability first disclosed.
  2. 27-01-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.02 pp

From 0.17% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Linuxfoundation1 product
Opensuse1 product
  • python-sigstore&distro=openSUSE Tumbleweed< 4.2.0-1.1
PyPI1 product
  • sigstore< 4.2.0
Sigstore1 product

4 vendors · 4 products

References

8 links