CVE-2026-108604 Tabularis through 0.27.0 Read-Only Bypass via MCP run_query SELECT Classification
Attackers can bypass read-only restrictions in Tabularis to modify data by submitting malicious SELECT statements via the MCP interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-108604?
CVE-2026-108604 is a medium-severity missing authorization vulnerability in TabularisDB tabularis, published on 10 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Tabularis through 0.27.0 contains an incorrect authorization vulnerability in the MCP run_query safety gate that allows prompt-injected agents or untrusted MCP clients to bypass read-only mode by submitting side-effecting SELECT statements. Attackers can run statements like SELECT setval, nextval, or PostgreSQL query_to_xml with embedded DELETE to modify data without approval prompts.
Weakness: CWE-863
Which versions are affected by CVE-2026-108604?
How do I fix CVE-2026-108604?
No fix has been published for CVE-2026-108604 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-108604 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108604 exists.
Sources
Also known as GHSA-jj9h-m6r9-g37h.