CVE-2026-33429

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.54 and 9.6.0-alpha.43, an attacker can subscribe to LiveQuery with a watch parameter targeting a protected field. Although the protected field value is properly stripped from event payloads, the presence or absence of update events reveals whether the protected field changed, creating a binary oracle. For boolean protected fields, the timing of change events is equivalent to knowing the field value. This issue has been patched in versions 8.6.54 and 9.6.0-alpha.43.

References

• https://github.com/parse-community/parse-server/commit/0c0a0a5a37ca821d2553119f2cb3be35322eda4b
• https://github.com/parse-community/parse-server/commit/c62eacaf38de86913f09240583448360b1cc8e67
• https://github.com/parse-community/parse-server/pull/10253
• https://github.com/parse-community/parse-server/pull/10254
• https://github.com/parse-community/parse-server/security/advisories/GHSA-qpc3-fg4j-8hgm