What’s Vulnerable › Vulnerabilities

CVE-2021-41109: LiveQuery publishes user session tokens

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-30 · updated 2026-06-17
• Weakness: CWE-200

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to version 4.10.4, for regular (non-LiveQuery) queries, the session token is removed from the response, but for LiveQuery payloads it is currently not. If a user has a LiveQuery subscription on the `Parse.User` class, all session tokens created during user sign-ups will be broadcast as part of the LiveQuery payload. A patch in version 4.10.4 removes session tokens from the LiveQuery payload. As a workaround, set `user.acl(new Parse.ACL())` in a beforeSave trigger to make the user private already on sign-up.

Affected products

• parse-community parse-server: before 4.10.4 — fixed in 4.10.4

How to fix

Upgrade to a fixed version: parse-community parse-server 4.10.4. Check the vendor advisory for mitigations.

References

• https://github.com/parse-community/parse-server/commit/4ac4b7f71002ed4fbedbb901db1f6ed1e9ac5559
• https://github.com/parse-community/parse-server/releases/tag/4.10.4
• https://github.com/parse-community/parse-server/security/advisories/GHSA-7pr3-p5fm-8r9x
• https://github.com/parse-community/parse-server/commit/4ac4b7f71002ed4fbedbb901db1f6ed1e9ac5559
• https://github.com/parse-community/parse-server/releases/tag/4.10.4
• https://github.com/parse-community/parse-server/security/advisories/GHSA-7pr3-p5fm-8r9x

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