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TI-2026-70587 Aliases CVE-2026-108604GHSA-jj9h-m6r9-g37h

Read-only bypass in Tabularis MCP run_query via SELECT statements

Priority MEDIUM 61CWE-863Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Tabularis through 0.27.0 has an incorrect authorization flaw (CWE-863) in the MCP run_query safety gate. Submitting SELECT statements with side effects bypasses read-only mode. A prompt-injected agent or untrusted MCP client can modify data without an approval prompt, per the CVSS 4.0 vector's local attack vector (AV:L) and user interaction requirement (UI:P). The flaw is not listed in CISA KEV, and the references link no exploit.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.002 9th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TabularisDBtabularisup to 0.27.0—No fix listedCNA
  • tabularis VendorTabularisDB Affected up to 0.27.0 Fixed in — No fix listed CNA

Remediation

No fixed version is listed for tabularis.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-11 Threatist record created from CVE-2026-108604
  2. 2026-10-11 Alias added: GHSA-jj9h-m6r9-g37h
  3. 2026-10-11 Priority changed: MEDIUM → LOW
  4. 2026-10-13 CISA SSVC decision points changed
  5. 2026-10-13 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 3

  • TI-2026-81666 Tabularis SQL Injection via MCP describe_table table_name CVSS 4.0HIGH 8.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences