Vulnerability in Zulip
CVE-2025-27149
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Zulip — versions >= 2.1.0, < 10.0
- Zulip Server
Weakness classification (CWE)
References
- github.com/zulip/zulip/security/advisories/GHSA-358p-x39m-99mm (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-27149?
- CVE-2025-27149 is a low-severity vulnerability in Zulip, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 2.7/10. Published 2025-03-31.
- How severe is CVE-2025-27149?
- Low severity. CVSS v3 base score is 2.7 out of 10.