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

Advisories

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

severity: medium
date: 10/10/2026
Affecting: tabularis <= 0.27.0
CVE: CVE-2026-108604
CWE: CWE-863 Incorrect Authorization
CVSS: 5.8
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://hackmd.io/@haind/S1BofaIsMx
https://github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/src-tauri/src/ai_activity.rs#L357-L416
https://github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/src-tauri/src/mcp/mod.rs#L1136-L1171
https://github.com/TabularisDB/tabularis
Credit: HaiND from the Post and Telecommunication Institute of Technology
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.

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