CVE-2026-66877CWE-284broken-access-control

CVE-2026-66877

High · published October 14, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
35.9
In the wild
Unconfirmed
What it is

Gitea enforces first-time fork contributor approval by blocking jobs, but some job transition and dispatch paths do not re-check the run's approval requirement. A separate run sharing a job-level concurrency group can cancel a pending job and cause its blocked sibling jobs to be re-emitted and dispatched without approval. This allows unreviewed workflow code to execute on self-hosted runners; fork secrets remain withheld and the run token remains read-only.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00426 · 35.9th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-10-14T19:17Z
References (5)
EPSS history
Timeline
  • 16 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 14 OCT 14:36Z
    Gitea fork workflow approval bypass through concurrency cancellation
    cvelistv5
  • 14 OCT 14:36Z
    Gitea fork workflow approval bypass through concurrency cancellation
    cvelistv5