CVE-2026-55666

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

Published: Jun 24, 2026Updated: Jun 29, 2026 Sources: CVE List NVDCWE-287

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-287 CWE-288

Affected Products

RocketChat

oss-projectaka rocket chat, rocketchat server, rocket.chat

Rocket.ChatMixed

Communications / messaging-chat

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-wx3c-76rf-wpwf

github.com

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