Auth bypass in Tabularisdb Tabularis
CVE-2026-108604
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.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind/S1BofaIsMx (third-party-advisory)
- github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/… (technical-description)
- github.com/TabularisDB/tabularis/blob/804c4c3bb6fd8eaa2e36cbe49f6c0d58f373b5e9/… (technical-description)
- github.com/TabularisDB/tabularis (product)
- www.vulncheck.com/advisories/tabularis-through-0.27.0-read-only-bypass-via-mcp-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108604?
- CVE-2026-108604 is a medium-severity vulnerability in Tabularisdb Tabularis, classified under Incorrect Authorization. CVSS score: 6.3/10. Published 2026-10-10.
- How severe is CVE-2026-108604?
- Medium severity. CVSS v3 base score is 6.3 out of 10.