🛡️ CVE-2025-27149 — zulip-server

🟢 CVSS 2.7 — Low ✅ No Known Exploit CWE-497 NVD
2.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2025-27149 is classified as CWE-497: Exposure of System Data to Unauthorized Control Sphere. Internal system details are revealed to callers who should not have them.

Affected software

CVE-2025-27149 is recorded against 1 package.

  • zulip-server (from 2.1.0 up to 10.0)

Timeline and source

Published on 31 March 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com

Details

Severity LOW
CVSS Score 2.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
CWE CWE-497
Public Exploit ✅ No
Source NVD
Published 2025-03-31
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
zulip-server 2.1.0 10.0

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