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CVE-2026-55666

Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • RocketChat Rocket.Chat

    From 8.5.0-rc.0 · fixed in 8.5.1; From 8.4.0-rc.0 · fixed in 8.4.4; From 8.3.0-rc.0 · fixed in 8.3.6; From 8.2.0-rc.0 · fixed in 8.2.6; From 8.1.0-rc.0 · fixed in 8.1.6; From 7.11.0-rc.0 · fixed in 8.0.7; fixed in 7.10.13

References 1

GitHub · RocketChat/Rocket.Chat