CVE-2026-55666
Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth
Description
Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13, in apps/meteor/app/apple/server/loginHandler.ts, handleIdentityToken parses a JWT issued by Apple during the OAuth flow. The try block checks for an email parameter. If the JWT does not contain an email address, the application falls back to accepting an arbitrary email value supplied directly in the request. Attackers are able to forge Apple JWTs that do not contain an email address and leverage this vulnerability to carry out account takeover attacks. This vulnerability is fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, and 7.10.13.
INFO
Published Date :
June 24, 2026, 9:06 p.m.
Last Modified :
June 24, 2026, 9:06 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update Rocket.Chat to version 8.5.1 or later.
- Apply available security patches for your Rocket.Chat version.
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