CVE-2026-66877

🎯 CVE-2026-66877 🧪 PoC 🇪🇺 EUVD

💬 0 Diskussion 📄 .md Alle CVEs anzeigen ✕

CVE-2026-66877 | 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.

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.

Klassifikation & Betroffenheit:

CWE-284 Gitea Gitea 0 ≤1.27.2

Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

🛡️ Empfohlene Mitigation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-19 · Embedding Scripts within Scripts (High) CAPEC-441 · Malicious Logic Insertion (High) CAPEC-478 · Modification of Windows Service Configur… (High) CAPEC-479 · Malicious Root Certificate (Low) CAPEC-502 · Intent Spoof CAPEC-503 · WebView Exposure CAPEC-536 · Data Injected During Configuration (High) CAPEC-546 · Incomplete Data Deletion in a Multi-Tena… (Medium)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.009 · Obfuscated Files or Information: E… T1546.004 · Event Triggered Execution:.bash_pr… T1546.016 · Event Triggered Execution: Install… T1574.011 · Hijack Execution Flow:Service Regi… T1543.003 · Create or Modify System Process:Wi… T1553.004 · Subvert Trust Controls:Install Roo…

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-19274 9.6 CVE-2026-56443 9.6 CVE-2026-58426 9.6 CVE-2026-22874 9.6 CVE-2026-46861 9.6

🩹 Patch verfügbar (OSV):

🩹 146cc3eec57174711eac0e0a0c7b38670c6e3922 (Commit)

🇩🇪 BSI-Sicherheitshinweise: BSI · hoch · Gitea: Mehrere Schwachstellen ermöglichen Ausführen von beliebigem Pro ↗

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 10/2026

Heute 09.11.

CVSS-Vektor-Analyse: 8.1

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Gering

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Keine

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Veröffentlicht:14.10.2026

Aktualisiert:15.10.2026 04:18

Assigner (CNA):Gitea

EUVD-ID:EUVD-2026-101089

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

CWE-284 ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

Tier	CVEs	Anteil
≥90 %	785	0,2 %
≥50 %	3.559	0,9 %
≥10 %	13.139	3,2 %
<10 %	396.072	95,8 %

Tier

CVEs

Anteil

≥90 %

785

0,2 %

≥50 %

3.559

0,9 %

≥10 %

13.139

3,2 %

<10 %

396.072

95,8 %

8.1 HIGH

EPSS

0.4%

CVE-2026-66877 🌐 Netzwerk (Remote) 🔑 Geringe Nutzerrechte nötig

Gitea

CVE-2026-66877 | 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.

CWE-284 ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Sicherheits-Update des Herstellers zeitnah einspielen und Netzwerksegmentierung prüfen.

vor 25 Tagen ↻ vor 25 Tagen

🛡️ Details ➔

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