What’s Vulnerable › Vulnerabilities
CVE-2025-27149: Zulip exports can leak private data
- Severity: low (CVSS 2.7 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: 2025-03-31 · updated 2026-06-17
- Weakness: CWE-497
Description
Zulip server provides an open-source team chat that helps teams stay productive and focused. Prior to 10.0, the data export to organization administrators feature in Zulip leaks private data. The collection of user-agent types identifying specific integrations or HTTP libraries (E.g., ZulipGitlabWebhook, okhttp, or PycURL) that have been used to access any organization on the server was incorrectly included in all three export types, regardless of if they were used to access the exported organization or not. The "public data" and "with consent" exports metadata including the titles of some topics in private channels which the administrator otherwise did not have access to, and none of the users consented to exporting and metadata for which users were in a group DM together. This vulnerability is fixed in 10.0.
Affected products
- zulip: from 2.1.0 before 10.0 — fixed in 10.0
How to fix
Upgrade to a fixed version: zulip 10.0. Check the vendor advisory for mitigations.
References
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