Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)

published 2026-01-22 9 mo ago modified 2026-09-08 2 mo ago also BIT-gitea-2026-20888 , EUVD-2026-4265 , GHSA-9cgq-wp42-4rpq , GHSA-ccq9-c5hv-cf64 , GO-2026-4366

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits: 0; none known

Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface. A user with read access to pull requests may be able to cancel auto-merges scheduled by other users.

Patch / fix

fixed in 4 distros 2 links 3

go github.com/go-gitea/gitea 1.25.4
bitnami gitea 1.25.4
go code.gitea.io/gitea 1.25.4
gitea gitea 1.25.4

suse opensuse

govulncheck-vulndb openSUSE Leap 15.6 0.0.20260205T172317-150000.1.146.1

suse advisories SUSE-SU-2026:0403-1

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

github.com/go-gitea/gitea#36341 pull request
github.com/go-gitea/gitea#36356 pull request
github.com/go-gitea/gitea/releases/tag/v1.25.4 release

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-20888 updated 2026-06-27 cvss 4.3

gitea: Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)

Red Hat OpenShift Pipelines openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-pipelines-as-code-cli-rhel8, openshift-pipelines/pipelines-pipelines-as-code-cli-rhel9, openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel8, openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel9, openshift-pipelines/pipelines-pipelines-as-code-webhook-rhel8, +3 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-01-23)

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/go-gitea/gitea	<1.25.4	1.25.4
bitnami	gitea	<1.25.4	1.25.4
go	code.gitea.io/gitea	<1.25.4	1.25.4

Affected products

Gitea Gitea Open Source Git Server

Classification

Weakness

CWE-284 Improper Access Control
CWE-862 Missing Authorization

References

github.com /go-gitea/gitea/pull/36341
patch, web, issue-tracking
github.com /go-gitea/gitea/pull/36356
patch, web, issue-tracking
github.com /go-gitea/gitea/security/advisories/GHSA-ccq9-c5hv-cf64
vendor-advisory, broken-link, web
github.com /go-gitea/gitea/releases/tag/v1.25.4
release-notes, web, article
blog.gitea.com /release-of-1.25.4/
release-notes, article
nvd.nist.gov /vuln/detail/CVE-2026-20888
advisory, web
blog.gitea.com /release-of-1.25.4
web
github.com /go-gitea/gitea
package
github.com /advisories/GHSA-9cgq-wp42-4rpq
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary