What is CVE-2026-27657?

CVE-2026-27657 is a high-severity vulnerability in Gitea Open Source Git Server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-07-03.

How severe is CVE-2026-27657?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Gitea Open Source Git Server

CVE-2026-27657

Gitea versions before 1.25.5 allow a user to change another user's primary email address.

Vulnerability class: IDOR (Insecure Direct Object Reference)

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.0th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Gitea Open Source Git Server — versions 0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

88ee5874-cf24-4952-aea0-31affedb7ff2 (patch)
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-2026-27657?: CVE-2026-27657 is a high-severity vulnerability in Gitea Open Source Git Server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-07-03.
How severe is CVE-2026-27657?: High severity. CVSS v3 base score is 7.5 out of 10.