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CVE-2026-55666— Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth

Quick assessment

Affected
RocketChat Rocket.Chat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RocketChat rocket.chat是巴西RocketChat公司开源的一款团队协作即时通讯平台。 RocketChat Rocket.Chat 8.5.1之前版本、8.4.4之前版本、8.3.6之前版本、8.2.6之前版本、8.1.6之前版本、8.0.7之前版本和7.10.13之前版本存在授权问题漏洞，该漏洞源于handleIdentityToken函数解析Apple JWT时，若不包含电子邮件地址，则回退接受请求中任意电子邮件值，可能导致攻击者伪造Apple JWT进行账户接管攻击。

AI Predicted 9.8 Difficulty: Easy EPSS 0.41% · P32

Affected Version Matrix 7

VendorProduct Version RangeStatus
RocketChat Rocket.Chat >= 8.5.0-rc.0, < 8.5.1 affected
>= 8.4.0-rc.0, < 8.4.4 affected
>= 8.3.0-rc.0, < 8.3.6 affected
>= 8.2.0-rc.0, < 8.2.6 affected
>= 8.1.0-rc.0, < 8.1.6 affected
>= 7.11.0-rc.0, < 8.0.7 affected
< 7.10.13 affected
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I. Basic Information for CVE-2026-55666

Vulnerability Information
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Vulnerability Title
Rocket.Chat: Email Parameter Fallback Leads To Account Takeover Within Apple OAuth
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
RocketChat Rocket.Chat 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RocketChat rocket.chat是巴西RocketChat公司开源的一款团队协作即时通讯平台。 RocketChat Rocket.Chat 8.5.1之前版本、8.4.4之前版本、8.3.6之前版本、8.2.6之前版本、8.1.6之前版本、8.0.7之前版本和7.10.13之前版本存在授权问题漏洞，该漏洞源于handleIdentityToken函数解析Apple JWT时，若不包含电子邮件地址，则回退接受请求中任意电子邮件值，可能导致攻击者伪造Apple JWT进行账户接管攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RocketChat Rocket.Chat >= 8.5.0-rc.0, < 8.5.1 -

II. Public POCs for CVE-2026-55666

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III. Intelligence Information for CVE-2026-55666

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Vendor Advisories for CVE-2026-55666 (1)

Same Patch Batch · RocketChat · 2026-06-24 · 12 CVEs total

CVE-2026-45688 9.1 CRITICAL Rocket.Chat: Pre-Auth NoSQL Injection in CAS Login Handler leading to Arbitrary CAS/SAML U
CVE-2026-45689 9.1 CRITICAL Rocket.Chat: Pre-Auth NoSQL Injection in OAuth2 Token Endpoint leading to Arbitrary User A
CVE-2026-45687 8.5 HIGH Rocket.Chat: Authenticated Arbitrary Data Export Theft via Mass Assignment in sendFileMess
CVE-2026-55762 8.1 HIGH Rocket.Chat: Any Authenticated User Can Permanently Deregister Workspace from Rocket.Chat
CVE-2026-55759 7.4 HIGH Rocket.Chat: Apple Sign-In skips JWT claims validation, allowing expired and cross-audienc
CVE-2026-49278 6.7 MEDIUM Rocket.Chat: Livechat Visitor Profile Disclosure Leaks Bearer Token and Enables Visitor Im
CVE-2026-47733 4.4 MEDIUM Rocket.Chat: Missing URL protocol sanitization in ImageElement allows javascript: URLs in
CVE-2026-45677 Rocket.Chat: Lack of SAML Signature Check During Logout Could Lead To DoS
CVE-2026-45757 Rocket.Chat: users.deactivateIdle` deactivates accounts without revoking existing login to
CVE-2026-49277 Rocket.Chat: OAuth access and refresh tokens remain valid after account deactivation
CVE-2026-46423 Rocket.Chat: SAML signature validation skipped when IdP certificate field is empty

IV. Related Vulnerabilities

Same product: Rocket.Chat
Same vendor: RocketChat
Same weakness: CWE-287

V. Comments for CVE-2026-55666

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