Zulip up to 9.x information expsure

Summaryinfo

A vulnerability, which was classified as problematic, was found in Zulip up to 9.x. Affected by this vulnerability is an unknown functionality. Such manipulation leads to information expsure. This vulnerability is uniquely identified as CVE-2025-27149. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Zulip up to 9.x. It has been rated as problematic. Affected by this issue is some unknown functionality. The manipulation with an unknown input leads to a information expsure vulnerability. Using CWE to declare the problem leads to CWE-497. The product does not properly prevent sensitive system-level information from being accessed by unauthorized actors who do not have the same level of access to the underlying system as the product does. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-27149 since 02/19/2025. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 10.0 eliminates this vulnerability.

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Productinfo

Name

• Zulip

Version

• 9.x

Website

• Product: https://github.com/zulip/zulip/

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CPE 2.2info

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