Vulnerability · Published Oct 10, 2026 · Assigned by VulnCheck

CVE-2026-108604Tabularis through 0.27.0 Read-Only Bypass via MCP run_query SELECT Classification

Medium 6.3

In plain English

A medium-severity incorrect authorization in tabularis from TabularisDB. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.2%top 90.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
TabularisDB	tabularis	0 – through 0.27.0

Weakness: CWE-863 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

References

https://hackmd.io/@haind/S1BofaIsMx third-party-advisory
https://github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/src-tauri/src/ai_activity.rs#L357-L416 technical-description
https://github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/src-tauri/src/mcp/mod.rs#L1136-L1171 technical-description
https://github.com/TabularisDB/tabularis product
VulnCheck Advisory: Tabularis through 0.27.0 Read-Only Bypass via MCP run_query SELECT Classification third-party-advisory