---
cve: "CVE-2026-52811"
severity: "CRITICAL"
cvss: 9.0
epss: "0.5%"
vendor: "gogs"
kev: false
exploited: false
published: "2026-06-24 20:31:38"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T06:56:54+02:00"
---

# CVE-2026-52811

> 9.0 CRITICAL · 🧪 PoC

## Beschreibung

Gogs is an open source self-hosted Git service. Prior to 0.14.3, (*Repository).UploadRepoFiles checks for symlinks only on the leaf of the upload target (osx.IsSymlink(targetPath)). The siblings UpdateRepoFile, DeleteRepoFile, and GetDiffPreview use hasSymlinkInPath, which lstats every component — UploadRepoFiles is the lone outlier. An attacker with repo-write access plus a multipart upload whose filename contains a literal backslash (preserved by filepath.Base on Linux, then converted to / by pathx.Clean) redirects the write through a previously-committed directory symlink. iox.CopyFile opens the destination with os.Create (no O_NOFOLLOW), so the kernel follows the parent symlink and writes attacker bytes anywhere the gogs UID can write — ~git/.ssh/authorized_keys → SSH foothold, or .git/hooks/post-receive → next-push RCE. This vulnerability is fixed in 0.14.3.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 04cb8afbb01d855454e59977a1cdbf522ea1db31 (Commit)
- 3ba8aca90e17e5410b7e8b227c9f29256ac3e875 (Commit)

## BSI-Hinweise (deutsch)

- [Gogs: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2013)

## Referenzen

- <https://github.com/gogs/gogs/security/advisories/GHSA-89mr-xqfv-758m>
- <https://github.com/gogs/gogs/pull/8332>
- <https://github.com/gogs/gogs/commit/04cb8afbb01d855454e59977a1cdbf522ea1db31>
- <https://github.com/gogs/gogs/releases/tag/v0.14.3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-52811) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_