zulip server vulnerabilities and fixes

Recent CVEs affecting zulip server, with upgrade or downgrade steps. 1 tracked.

Also searched as: zulipserver.

zulip server has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 0. Most recent: 2026-05-12. Highest priority: CVE-2026-40300 (score 32/100).

• CVE-2026-40300 MEDIUM 6.5 DOWNGRADE Zulip is an open-source team collaboration tool

FAQ

How do I fix zulip server vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is zulip server being exploited right now?

None of the tracked zulip server CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which zulip server CVE should I patch first?

CVE-2026-40300 currently ranks highest (32/100): Zulip is an open-source team collaboration tool.

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