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CVE-2026-45677— Rocket.Chat: Lack of SAML Signature Check During Logout Could Lead To DoS

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 8.5.0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、8.1.4之前版本、8.0.5之前版本、7.13.7之前版本和7.10.11之前版本存在授权问题漏洞，该漏洞源于SAML集成未验证入站LogoutRequest消息签名，可能导致未经身份验证的远程攻击者构造未签名的LogoutRequest并提交到SP注销端点，立即销毁受害者

AI Predicted 7.5 Difficulty: Easy EPSS 0.68% · P51

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-2026-45677

Vulnerability Information
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Vulnerability Title
Rocket.Chat: Lack of SAML Signature Check During Logout Could Lead To DoS
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 SAML integration does not verify the signature on inbound LogoutRequest messages. An unauthenticated remote attacker who knows a target user's SAML NameID - which major identity providers (Okta, Google Workspace, Microsoft Entra ID, JumpCloud) expose as the user's email address - can craft a valid-looking unsigned LogoutRequest and submit it to the SP logout endpoint. The server processes it as legitimate, immediately destroying the victim's session. Because the attack requires no authentication and no interaction from the victim, it can be repeated in a loop against individual users or scripted across many accounts, effectively rendering the Rocket.Chat instance unusable for SAML-authenticated users. 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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 8.5.0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、8.1.4之前版本、8.0.5之前版本、7.13.7之前版本和7.10.11之前版本存在授权问题漏洞，该漏洞源于SAML集成未验证入站LogoutRequest消息签名，可能导致未经身份验证的远程攻击者构造未签名的LogoutRequest并提交到SP注销端点，立即销毁受害者
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-2026-45677

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III. Intelligence Information for CVE-2026-45677

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Vendor Advisories for CVE-2026-45677 (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-2026-45757 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-862

V. Comments for CVE-2026-45677

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