---
cve: "CVE-2026-102876"
severity: "HIGH"
cvss: 8.6
epss: "0.3%"
vendor: "surrealdb"
kev: false
exploited: false
published: "2026-09-29 20:17:18"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T02:41:32+02:00"
---

# CVE-2026-102876

> 8.6 HIGH · 🧪 PoC

## Beschreibung

SurrealDB before 3.3.0 contains an authorization bypass in HTTP session construction where check_auth() verifies credentials against Surreal-Auth-NS and Surreal-Auth-DB headers but constructs sessions using Surreal-NS and Surreal-DB headers without validating access permissions. Attackers can authenticate as a user from one tenant while selecting another tenant's namespace and database to read, create, and modify records across tenant boundaries.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-02 12:25:20
- CNA-CVSS: **8.6** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

## Patch verfügbar (OSV)

- 5000e233b4a8b96689c82715c172061dcf711d31 (Commit)

## Referenzen

- <https://github.com/surrealdb/surrealdb/security/advisories/GHSA-vx2p-7hhm-wv62>
- <https://github.com/surrealdb/surrealdb/commit/5000e233b4a8b96689c82715c172061dcf711d31>
- <https://github.com/surrealdb/surrealdb/blob/v3.2.4/surrealdb/server/src/ntw/auth.rs>
- <https://github.com/surrealdb/surrealdb/releases/tag/v3.3.0>
- <https://github.com/surrealdb/surrealdb>
- <https://www.vulncheck.com/advisories/surrealdb-before-3.3.0-cross-tenant-access-via-headers>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-102876) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_