CVE-2026-55666: CWE-287: Improper Authentication in RocketChat Rocket.Chat
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.
AI Analysis
Technical Summary
Rocket.Chat versions before 7.10.13, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4, and 8.5.1 contain an improper authentication vulnerability (CWE-287) in the Apple OAuth login handler (apps/meteor/app/apple/server/loginHandler.ts). The function handleIdentityToken parses Apple-issued JWTs during OAuth login and checks for an email parameter. If the JWT lacks an email, the application incorrectly falls back to accepting an arbitrary email supplied in the request. Attackers can exploit this to forge Apple JWTs without emails and perform account takeover attacks. The vulnerability is resolved in the listed fixed versions.
Potential Impact
An attacker can bypass proper authentication by exploiting the fallback mechanism that accepts arbitrary email values when the Apple JWT lacks an email claim. This enables account takeover attacks, compromising user accounts without needing valid Apple JWTs containing emails. The vulnerability is rated critical with a CVSS 4.0 score of 9.3, indicating high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in Rocket.Chat versions 7.10.13, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4, and 8.5.1. Users should upgrade to one of these versions or later to remediate the issue. No official remediation level is provided beyond these fixed versions. Patch status is confirmed by the vendor advisory. No additional mitigations are specified.
CVE-2026-55666: CWE-287: Improper Authentication in RocketChat Rocket.Chat
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.
CVSS v4.0
Score 9.3critical
Affected software
pkg:github/rocketchat/Rocket.ChatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Rocket.Chat versions before 7.10.13, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4, and 8.5.1 contain an improper authentication vulnerability (CWE-287) in the Apple OAuth login handler (apps/meteor/app/apple/server/loginHandler.ts). The function handleIdentityToken parses Apple-issued JWTs during OAuth login and checks for an email parameter. If the JWT lacks an email, the application incorrectly falls back to accepting an arbitrary email supplied in the request. Attackers can exploit this to forge Apple JWTs without emails and perform account takeover attacks. The vulnerability is resolved in the listed fixed versions.
Potential Impact
An attacker can bypass proper authentication by exploiting the fallback mechanism that accepts arbitrary email values when the Apple JWT lacks an email claim. This enables account takeover attacks, compromising user accounts without needing valid Apple JWTs containing emails. The vulnerability is rated critical with a CVSS 4.0 score of 9.3, indicating high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is fixed in Rocket.Chat versions 7.10.13, 8.0.7, 8.1.6, 8.2.6, 8.3.6, 8.4.4, and 8.5.1. Users should upgrade to one of these versions or later to remediate the issue. No official remediation level is provided beyond these fixed versions. Patch status is confirmed by the vendor advisory. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T00:05:03.777Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c501e4853345fc1e45c60
Added to database: 06/24/2026, 21:46:06 UTC
Last enriched: 07/01/2026, 22:20:03 UTC
Last updated: 08/09/2026, 00:41:15 UTC
Views: 75
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