# CVE-2025-27149: Zulip exports can leak private data

> Zulip server exports leak private user-agent data and private channel metadata to administrators, exposing sensitive information without consent.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 31 Mar 2025
- **Updated:** 31 Mar 2025
- **Also known as:** GHSA-358p-x39m-99mm

## What is CVE-2025-27149?

CVE-2025-27149 is a medium-severity vulnerability in zulip, published on 31 Mar 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere)

## Which versions are affected by CVE-2025-27149?

It affects 1 product.


Products: Zulip Zulip Server.

## How do I fix CVE-2025-27149?

No fix has been published for CVE-2025-27149 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-27149 being exploited?

There is no known exploitation of CVE-2025-27149 in the wild and no public exploit code.

## Other vulnerabilities in zulip

- [CVE-2019-18933](https://insights.sbomify.com/CVE-2019-18933/): Information disclosure in n/a (critical 9.8)
- [CVE-2020-15070](https://insights.sbomify.com/CVE-2020-15070/): Code injection in n/a (high 8.8)
- [CVE-2017-0910](https://insights.sbomify.com/CVE-2017-0910/): Missing authorization in Zulip Server (high 8.8)
- [CVE-2025-31478](https://insights.sbomify.com/CVE-2025-31478/): Zulip Authentication Backend Configuration Bypass (high 8.2)
- [CVE-2023-33186](https://insights.sbomify.com/CVE-2023-33186/): Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27149 and fix it if it is affected.

What it is: CVE-2025-27149 is a medium-severity vulnerability in zulip, published on 31 Mar 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2025-27149 in the wild and no public exploit code.

Affected product: zulip. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-27149/ (Markdown: https://insights.sbomify.com/CVE-2025-27149/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27149
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27149
- OSV: https://osv.dev/vulnerability/CVE-2025-27149

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27149/
Summaries are generated and may contain mistakes; the official description above is the record.