Zulip Server
CVE-2026-24050
MEDIUM
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionGitHub Advisory
Zulip is an open-source team collaboration tool. From 5.0 to before 11.5, some administrative actions on the user profile were susceptible to stored XSS in group names or channel names. Exploiting these vulnerabilities required the user explicitly interacting with the problematic object. This vulnerability is fixed in 11.5.
AnalysisAI
Stored cross-site scripting in Zulip Server versions 5.0 through 11.4 allows authenticated attackers to execute arbitrary JavaScript through malicious group or channel names when administrators interact with user profile management features. An attacker with the ability to create or modify groups/channels can inject payloads that execute in the context of an administrator's session, potentially compromising account security or sensitive data. A patch is available in version 11.5.
Technical ContextAI
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Zulip Server. Zulip is an open-source team collaboration tool. From 5.0 to before 11.5, some administrative actions on the user profile were susceptible to stored XSS in group names or channel names. Exploiting these vulnerabilities required the user explicitly interacting with the problematic object. This vulnerability is fixed in 11.5.
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 11.5.. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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