Vulnerability DatabaseCVE-2026-55666
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CVE-2026-55666
Published:June 24, 2026
Updated:June 29, 2026
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.
Affected Packages
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=8.1.0 <8.1.6
Fix Suggestion:
Update to version 8.1.6
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=8.3.0 <8.3.6
Fix Suggestion:
Update to version 8.3.6
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=8.0.0 <8.0.7
Fix Suggestion:
Update to version 8.0.7
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=8.4.0 <8.4.4
Fix Suggestion:
Update to version 8.4.4
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=0.8.0 <7.10.13
Fix Suggestion:
Update to version 7.10.13
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) =8.5.0 <8.5.1
Fix Suggestion:
Update to version 8.5.1
https://github.com/RocketChat/Rocket.Chat.git (GITHUB):
Affected version(s) >=8.2.0 <8.2.6
Fix Suggestion:
Update to version 8.2.6
Related Resources (1)
https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-wx3c-76rf-wpwf
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Authentication
CWE-287
Authentication Bypass Using an Alternate Path or Channel
CWE-288
EPSS
Base Score:
0.29