What’s Vulnerable › Vulnerabilities

CVE-2026-24050: Zulip affected by Stored XSS in user profile modal

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-06 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• zulip: from 5.0 before 11.5 — fixed in 11.5

How to fix

Upgrade to a fixed version: zulip 11.5. Check the vendor advisory for mitigations.

References

• https://github.com/zulip/zulip/commit/e6093d9e4788f4d82236d856c5ed7b16767886a7
• https://github.com/zulip/zulip/releases/tag/11.5
• https://github.com/zulip/zulip/security/advisories/GHSA-56qv-8823-6fq9
• https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-11-5

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