CVE-2026-31856

Description

### Impact A SQL injection vulnerability exists in the PostgreSQL storage adapter when processing `Increment` operations on nested object fields using dot notation (e.g., `stats.counter`). The `amount` value is interpolated directly into the SQL query without parameterization or type validation. An attacker who can send write requests to the Parse Server REST API can inject arbitrary SQL subqueries to read any data from the database, bypassing CLPs and ACLs. MongoDB deployments are not affected. ### Patches The fix adds type validation to reject non-number values and parameterizes the value in the SQL query instead of interpolating it. ### Workarounds There is no known workaround. ### References - GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q3vj-96h2-gwvg - Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.6.0-alpha.3 - Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.29

How to fix CVE-2026-31856

To remediate CVE-2026-31856, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.29 or later
• —upgrade to 9.6.0-alpha.3 or later

Is CVE-2026-31856 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.29, >= 9.0.0, < 9.6.0
• >= 9.0.0-alpha.1, < 9.6.0-alpha.3

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-31856
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.29
• WEBgithub.com/parse-community/parse-server/releases/tag/9.6.0-alpha.3