Improper Protection Vulnerability in PostgreSQL Affects Multiple Versions
CVE-2026-120154

4.3MEDIUM

Key Information:

Vendor

PostgreSQL
Status
Postgresql
Vendor
CVE Published:
12 November 2026

What is CVE-2026-120154?

An improper protection vulnerability in PostgreSQL allows an attacker with INSERT, UPDATE, and appropriate SELECT privileges to bypass row security policies. By exploiting the iterated INSERT ... ON CONFLICT DO UPDATE, it becomes possible to access any row within the affected table. This security flaw affects PostgreSQL versions prior to 18.7, 17.12, 16.16, 15.20, and 14.25, highlighting the need for immediate updates to prevent unauthorized data accessibility.

Affected Version(s)

PostgreSQL 18 < 18.7

PostgreSQL 17 < 17.12

PostgreSQL 16 < 16.16

References

https://www.postgresql.org/support/security/CVE-2026-120154/

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

The PostgreSQL project thanks Peter Geoghegan, Zsolt Parragi, Only see myself, Nicholas Carlini, Joao Detomini, Josef Šimánek, and Qing Xu for reporting this problem.
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