GHSA-x6fw-778m-wr9v Parse Server: JWT audience validation bypass in Google, Apple, and Facebook authentication adapters

• npm parse-server: >= 9.0.0-alpha.1, < 9.5.0-alpha.11 → fixed in 9.5.0-alpha.11 • npm parse-server: < 8.6.10 → fixed in 8.6.10

Impact The Google, Apple, and Facebook authentication adapters use JWT verification to validate identity tokens. When the adapter's audience configuration option is not set (`clientId` for Google/Apple, `appIds` for Facebook), JWT verification silently skips audience claim validation. This allows an attacker to use a validly signed JWT issued for a different application to authenticate as any user on the target Parse Server. • For Google and Apple, the vulnerability is exploitable when the server does not configure `clientId`. The adapters accepted this as valid and simply skipped audience validation. • For Facebook Limited Login, the vulnerability exists regardless of configuration. The adapter validated `appIds` only for Standard Login (Graph API), but the Limited Login JWT path never passed `appIds` as the audience to JWT verification. Patches The fix enforces `clientId` (Google/Apple) and `appIds` (Facebook) as mandatory and passes them to JWT verification for audience validation. While this is technically a breaking change for servers that omit these options, it is not a breaking change as per documentation — all three options are documented as required configuration. Workarounds • Google / Apple: Ensure `clientId` is set in the adapter configuration. When set, JWT verification correctly validates the audience claim even on unpatched versions. • Facebook Limited Login: There is no workaround. The unpatched adapter does not pass `appIds` to JWT audience validation, so the only mitigation is to upgrade. References • GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-x6fw-778m-wr9v • Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.11 • Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.10