CVE-2026-20800 | Notification API Leaks Private Repository Issue Titles After Collaborator Permission Revocation

Gitea's notification API does not re-validate repository access permissions when returning notification details. After a user's access to a private repository is revoked, they may still view issue and pull request titles through previously received notifications.

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-2026-20800 is rated Low Risk (26.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2026-20800

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 — 0.01% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20800

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-20800

GitHub Security Advisory for CVE-2026-20800

GHSA-2vgv-hgv4-22mh · Severity: low · Ecosystem: go — Gitea improperly exposes issue and pull request titles

OS Trackers for CVE-2026-20800

vendor priority summary link
alpine — CVE-2026-20800: 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-2026-20800

Affected software / configurations for CVE-2026-20800

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

References for CVE-2026-20800

cvelogic Threat Intelligence