EUVD-2026-21500Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
5DescriptionCVE.org
An open redirect vulnerability in Rocket.Chat versions prior to 8.4.0 allows users to be redirected to arbitrary URLs by manipulating parameters within a SAML endpoint.
AnalysisAI
Open redirect vulnerability in Rocket.Chat SAML endpoint allows unauthenticated remote attackers to redirect users to arbitrary URLs by manipulating endpoint parameters, potentially enabling phishing attacks or credential theft. Affected versions prior to 8.4.0; patch available. EPSS score of 0.02% (4th percentile) indicates low real-world exploitation probability despite network-accessible attack vector.
Technical ContextAI
Rocket.Chat implements SAML (Security Assertion Markup Language) authentication endpoints that process user-supplied URL parameters for post-authentication redirects. CWE-601 (URL Redirection to Untrusted Site) occurs when the application fails to properly validate redirect destinations before directing users to external URLs. This is a common pattern in SSO implementations where the application must redirect users back to a requested resource after authentication succeeds. The vulnerability exists in the SAML endpoint handler, which accepts unvalidated redirect parameters without enforcing an allow-list of safe destination domains or performing proper URL validation.
RemediationAI
Vendor-released patch: Rocket.Chat 8.4.0 or later. Upgrade immediately to the latest stable release. For organizations unable to patch immediately, implement network-level controls to restrict outbound redirects or apply a Web Application Firewall (WAF) rule to detect and block suspicious redirect parameters in SAML endpoints (e.g., filter requests where redirect parameter values contain external domain names). GitHub PR #38994 contains the upstream fix; review the commit to understand validation changes applied. References: https://github.com/RocketChat/Rocket.Chat/pull/38994 and https://nvd.nist.gov/vuln/detail/CVE-2026-22560.
More in Open Redirect
View allA malicious third-party can give a crafted "ssh://..." URL to an unsuspecting victim, and an attempt to visit the URL ca
GFI Kerio Control versions 9.2.5 through 9.4.5 contain an HTTP response splitting vulnerability in the dest parameter of
PHP through 7.0.8 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect
Multiple open redirect vulnerabilities in Apache Struts 2.0.0 through 2.3.15 allow remote attackers to redirect users to
Open redirect vulnerability in age-verification.php in the Age Verification plugin 0.4 and earlier for WordPress allows
Open redirect vulnerability in Kaseya Virtual System Administrator (VSA) 7.x before 7.0.0.29, 8.x before 8.0.0.18, 9.0 b
Vulnerability in the Oracle Applications Framework component of Oracle E-Business Suite (subcomponent: Popup windows (li
Unspecified vulnerability in the Oracle Application Server Single Sign-On component in Oracle Fusion Middleware 10.1.4.3
Flarum is open source discussion platform software. Rated medium severity (CVSS 6.5), this vulnerability is remotely exp
Open redirect vulnerability in Novius OS 5.0.1 (Elche) allows remote attackers to redirect users to arbitrary web sites
Open redirect vulnerability in the Redirect function in stageshow_redirect.php in the StageShow plugin before 5.0.9 for
Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link. Rated crit
Share
External POC / Exploit Code
Leaving vuln.today