What is CVE-2026-27780?

CVE-2026-27780 is a critical-severity vulnerability in Gitea Open Source Git Server, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-07-03.

How severe is CVE-2026-27780?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Gitea Open Source Git Server

CVE-2026-27780

Gitea versions before 1.26.0 do not fail closed on bufio.Scanner errors while processing pre-receive hook input, allowing oversized input to bypass branch-protection checks.

Vulnerability class: Broken Access Control

Published 2026-07-03 · last modified 2026-07-06.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Gitea Open Source Git Server — versions 0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

88ee5874-cf24-4952-aea0-31affedb7ff2 (patch)
88ee5874-cf24-4952-aea0-31affedb7ff2 (release-notes)
88ee5874-cf24-4952-aea0-31affedb7ff2 (release-notes)

Frequently asked questions

What is CVE-2026-27780?: CVE-2026-27780 is a critical-severity vulnerability in Gitea Open Source Git Server, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-07-03.
How severe is CVE-2026-27780?: Critical severity. CVSS v3 base score is 9.8 out of 10.