# Mattermost makes Use of Weak Hash in github.com/mattermost/mattermost-server

Advisory record · `GHSA-9p92-x77w-9fw2`

- **Identifiers:** `GHSA-9p92-x77w-9fw2` · `CVE-2025-9078` · `GO-2025-3959`
- **State:** Confirmed
- **Severity:** CVSS 4.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-328](https://cwe.mitre.org/data/definitions/328.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Published:** 17 Sept 2025
- **Updated:** 3 Mar 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 17 Sept 2025, 17:03 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/mattermost/mattermost-server` (Go): affected `>=9.11.0+incompatible, <9.11.18+incompatible || >=10.5.0+incompatible, <10.5.9+incompatible || >=10.8.0+incompatible, <10.8.4+incompatible || >=10.9.0+incompatible, <10.9.4+incompatible || >=10.10.0+incompatible, <10.10.2+incompatible`; fixed in `9.11.18+incompatible`, `10.5.9+incompatible`, `10.8.4+incompatible`, `10.9.4+incompatible`, `10.10.2+incompatible`
- `github.com/mattermost/mattermost-server/v5` (Go): affected `all versions`; no fixed version yet
- `github.com/mattermost/mattermost-server/v6` (Go): affected `all versions`; no fixed version yet
- `github.com/mattermost/mattermost/server/v8` (Go): affected `<8.0.0-20250718075842-cd87e5c87737`; fixed in `8.0.0-20250718075842-cd87e5c87737`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`, from CNA (Mattermost)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0015, the 4th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 17 Sept 2025. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-9p92-x77w-9fw2](https://github.com/advisories/GHSA-9p92-x77w-9fw2)
- [OSV: GHSA-9p92-x77w-9fw2](https://osv.dev/vulnerability/GHSA-9p92-x77w-9fw2)
- <https://github.com/advisories/GHSA-9p92-x77w-9fw2>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-9078>
- <https://github.com/mattermost/mattermost/commit/356880c8430b77a4a390c89d5a33f6928188d137>
- <https://github.com/mattermost/mattermost/commit/944ad5cdd9876ef61c78c8275906262a4118755a>
- <https://github.com/mattermost/mattermost/commit/a8a4badc130be101e5bc4b7916bbcd2f966c4b79>
- <https://github.com/mattermost/mattermost/commit/cd87e5c877373f109742aa90a3fa136c14774325>
- <https://mattermost.com/security-updates>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-9p92-x77w-9fw2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-9p92-x77w-9fw2/>. Everything for agents: <https://agentprime.io/llms.txt>.