CVE-2026-34532

Parse Server: Cloud function validator bypass via prototype chain traversal

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.

Scores

Weaknesses (CWE)

• CWE-863

Advisories

• GHSA-vpj2-qq7w-5qq6 — parse-server has cloud function validator bypass via prototype chain traversal

European references

• ENISA EUVD · EUVD-2026-17473
• GCVE · GCVE-0-2026-34532

Affected configurations (NVD CPE)

• cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* < 8.6.67
• cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* ≥ 9.0.0 < 9.7.0
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha1:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha10:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha2:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha3:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha4:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha5:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha6:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha7:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha8:*:*:*:node.js:*:*
• cpe:2.3:a:parseplatform:parse-server:9.7.0:alpha9:*:*:*:node.js:*:*

Affected products

References

• https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6
• https://github.com/parse-community/parse-server/pull/10342
• https://github.com/parse-community/parse-server/pull/10343
• https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7
• https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674

Sources