CVE-2026-54442
Description
A flaw was found in Emissary. The application fails to properly validate navigation links, accepting protocol-relative and malformed web addresses. An attacker with privileges to configure navigation links can exploit this flaw to redirect users to arbitrary external websites (an open redirect) or potentially trigger Server-Side Request Forgery (SSRF).
Statement
This vulnerability is rated as Moderate severity because exploitation requires high administrative privileges to configure navigation endpoints and necessitates user interaction to execute. Red Hat products do not ship or support Emissary, resulting in no direct impact on supported Red Hat environments. Where standalone instances are deployed, the blast radius is constrained by the prerequisite administrative permissions and user interaction needed to trigger redirection.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
The user may be redirected to an untrusted page that contains malware which may then compromise the user's system. In some cases, an open redirect can also enable the immediate download of a file without the user's permission, because the redirection to an external site may lead to endpoints on those sites that automatically trigger a download action ("drive-by download" [REF-1478]). This will expose the user to extensive risk. The user's interaction with the web server may also be compromised if the malware conducts keylogging or other attacks that steal credentials, personally identifiable information (PII), or other important data.
Access Control,Confidentiality,Other
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity; Other
By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam. The user may be subjected to phishing attacks by being redirected to an untrusted page. The phishing attack may point to an attacker controlled web page that appears to be a trusted web site. The phishers may then steal the user's credentials and then use these credentials to access the legitimate web site. Because the server name in the modified link is identical to the original site, phishing attempts can appear more trustworthy.
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