Zulip exports can leak private data

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.

Scores

EPSS (exploitation in 30 days)

0.30% · top 77% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.6.

Weakness

• CWE-497: Exposure of Sensitive System Information to an Unauthorized Control Sphere (opens in a new tab)All about CWE-497 and its CVEs

Affected products

• zulip · zulip

  • affected >= 2.1.0, < 10.0

References (1)

• https://github.com/zulip/zulip/security/advisories/GHSA-358p-x39m-99mm (opens in a new tab)x_refsource_CONFIRM

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-27149](https://trackcve.app/badge/CVE-2025-27149.svg)](https://trackcve.app/cve/CVE-2025-27149)

Record last updated 31 Mar 2025, 18:36 UTC.