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CVE-2026-55666 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-wx3c-76rf-wpwf	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	[email protected]
CWE-288	Authentication Bypass Using an Alternate Path or Channel	[email protected]

Affected Products

Product	Versions
Rocket.Chat	< 8.5.1 (semver) < 8.4.4 (semver) < 8.3.6 (semver) < 8.2.6 (semver) < 8.1.6 (semver)
CPE cpe:2.3:a:rocket.chat:rocket.chat:::::::: Remediation Upgrade: 8.5.1moderate effort Upgrade: 8.4.4moderate effort Upgrade: 8.3.6moderate effort Upgrade: 8.2.6moderate effort Upgrade: 8.1.6moderate effort Upgrade: 8.0.7moderate effort Upgrade: 7.10.13moderate effort

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 29, 2026	CVE Modified	CISA-ADP
Jun 26, 2026	CVE Modified	CISA-ADP
Jun 24, 2026	New CVE Received	[email protected]