9.1

CVE-2026-26247: gitea gitea open source git server Improper Access Control

CVSS: 9.1v3.1CriticalDeferred
AliasesGHSA-m5ch-ppfx-xv3vGO-2026-6342
Published 03-07-2026Last modified 07-07-2026
Open JSON

Vulnerability summary

CVE-2026-26247 is a critical (CVSS 9.1) Improper Access Control vulnerability in gitea gitea open source git server. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.50%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
OPENSUSE-SU-2026:21812-1SUSE-SU-2026:23692-1SUSE-SU-2026:23712-1

Timeline

  1. 03-07-2026
    PublishedVulnerability first disclosed.
  2. 07-07-2026
    Last modifiedVulnerability information updated.

Description

Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

0.00 pp

From 0.50% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.50%

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

Code.gitea.io1 product
  • gitea< 1.25.5
Gitea1 product

2 vendors · 2 products

References

10 links