CVE-2026-20888 | Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web Endpoint (Authorization Bypass)

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.

Published: 2026-01-22 Last update: 2026-01-29 Assigner: 88ee5874-cf24-4952-aea0-31affedb7ff2 Source: 88ee5874-cf24-4952-aea0-31affedb7ff2
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20888 is rated Low Risk (18.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20888

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-23 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20888

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-20888

GitHub Security Advisory for CVE-2026-20888

GHSA-9cgq-wp42-4rpq · Severity: medium · Ecosystem: go — Gitea does not properly verify authorization when canceling scheduled auto-merges via the web interface

OS Trackers for CVE-2026-20888

vendor priority summary link
alpine — CVE-2026-20888: 1 source package rows (gitea); 44 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 44. https://security.alpinelinux.org/vuln/CVE-2026-20888
redhat medium — https://access.redhat.com/security/cve/CVE-2026-20888

Affected software / configurations for CVE-2026-20888

Vendor Product Version Raw CPE
gitea gitea < 1.25.4 cpe:2.3:a:gitea:gitea:*:*:*:*:*:-:*:*

References for CVE-2026-20888

cvelogic Threat Intelligence