---
cve: "CVE-2026-104976"
severity: "HIGH"
cvss: 8.7
epss: "0.3%"
vendor: "makeplane"
kev: false
exploited: false
published: "2026-10-05 18:17:32"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T23:50:49+01:00"
---

# CVE-2026-104976

> 8.7 HIGH · 🧪 PoC

## Beschreibung

Plane is an open-source project management tool. Prior to 1.4.0, Plane validates GITEA_HOST only for its URL scheme and does not reject hosts that resolve to private or internal IP addresses. The four outbound requests in the Gitea OAuth flow are derived from this unvalidated host and do not call validate_url(). In addition, avatar_url is taken from the Gitea user's profile, where users can configure external avatar URLs. After an administrator enables Gitea OAuth for a legitimate instance, a Gitea user can set an internal URL as the profile avatar and log in through Gitea, causing Plane to fetch the internal target without validation. This issue is fixed in 1.4.0.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-10-06 14:53:08
- CNA-CVSS: **8.7** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-918** — Server-Side Request Forgery (SSRF)
  The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

## Angriffsmuster (CAPEC)

- [CAPEC-664 — Server Side Request Forgery](https://capec.mitre.org/data/definitions/664.html) _(Severity: High)_

## Patch verfügbar (OSV)

- 917b23a6c16d93fc00cef67900eff2755e8b13f7 (Commit)
- 04622ce1188c4680951f0001e35efb342fe51615 (Commit)

## Referenzen

- <https://github.com/makeplane/plane/security/advisories/GHSA-hx79-5pj5-qh42>
- <https://github.com/makeplane/plane/pull/9163>
- <https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615>
- <https://github.com/makeplane/plane/releases/tag/v1.4.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-104976/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_