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CVE-2026-45688— Rocket.Chat: Pre-Auth NoSQL Injection in CAS Login Handler leading to Arbitrary CAS/SAML User Session Hijack

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。 Rocket.Chat存在输入验证错误漏洞，该漏洞源于CAS登录处理程序未对客户端提供的options.cas.credentialToken值进行运行时类型检查，可能导致未经身份验证的攻击者通过NoSQL操作符注入绕过CAS票据检查，在合法SSO登录过程中获取受害者的Meteor身份验证令牌。以下版本受到影响：8.5.0之前版本、8.4.1之前版本、8.3.3之前版本、8.2.3之前版本、8.1.

CVSS 9.1 · Critical EPSS 0.29% · P22

Affected Version Matrix 8

VendorProduct Version RangeStatus
RocketChat Rocket.Chat >= 8.5.0-rc.0, < 8.5.0 affected
>= 8.4.0-rc.0, < 8.4.1 affected
>= 8.3.0-rc.0, < 8.3.3 affected
>= 8.2.0-rc.0, < 8.2.3 affected
>= 8.1.0-rc.0, < 8.1.4 affected
>= 8.0.0-rc.0, < 8.0.5 affected
>= 7.11.0-rc.0, < 7.13.7 affected
< 7.10.11 affected
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I. Basic Information for CVE-2026-45688

Vulnerability Information
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Vulnerability Title
Rocket.Chat: Pre-Auth NoSQL Injection in CAS Login Handler leading to Arbitrary CAS/SAML User Session Hijack
Source: CVE Program / CVE List V5
Vulnerability Description
Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's CAS login handler forwards the client-supplied options.cas.credentialToken value straight into a MongoDB findOne({_id: ...}) query without any runtime type check. TypeScript's string parameter annotation is erased at runtime, so an unauthenticated attacker can substitute a MongoDB query operator ({"$gt": ""}, {"$ne": null}, etc.) for what the server expects to be an opaque ticket string. The injected operator matches the first unexpired document in the credential_tokens collection, bypassing the CAS ticket check entirely. When any legitimate CAS or SAML SSO login is in flight, the attacker's next DDP login call matches the same credential-token row via the NoSQL operator and is issued a full Meteor auth token (userId + token) bound to the victim. The token is immediately usable against the complete REST and DDP surface as that user. If the victim is an administrator, this escalates to full instance compromise via Apps-Engine app install. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5
Vulnerability Title
Rocket.Chat 输入验证错误漏洞
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。 Rocket.Chat存在输入验证错误漏洞，该漏洞源于CAS登录处理程序未对客户端提供的options.cas.credentialToken值进行运行时类型检查，可能导致未经身份验证的攻击者通过NoSQL操作符注入绕过CAS票据检查，在合法SSO登录过程中获取受害者的Meteor身份验证令牌。以下版本受到影响：8.5.0之前版本、8.4.1之前版本、8.3.3之前版本、8.2.3之前版本、8.1.
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, < 8.5.0 -

II. Public POCs for CVE-2026-45688

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III. Intelligence Information for CVE-2026-45688

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Vendor Advisories for CVE-2026-45688 (1)

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

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

IV. Related Vulnerabilities

Same product: Rocket.Chat
Same vendor: RocketChat
Same weakness: CWE-943

V. Comments for CVE-2026-45688

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