# matrix-js-sdk subject to user spoofing via Olm/Megolm protocol confusion

Advisory record · `GHSA-r48r-j8fx-mq2c`

- **Identifiers:** `GHSA-r48r-j8fx-mq2c` · `CVE-2022-39251`
- **State:** Confirmed
- **Severity:** CVSS 8.6 High
- **Critical:** No
- **Weakness (CWE):** [CWE-287](https://cwe.mitre.org/data/definitions/287.html) · [CWE-322](https://cwe.mitre.org/data/definitions/322.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md) · [CWE-322](https://agentprime.io/advisories/tag/cwe-322.md)
- **Published:** 30 Sept 2022
- **Updated:** 8 Nov 2023
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Sept 2022, 00:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `matrix-js-sdk` (npm): affected `<19.7.0`; fixed in `19.7.0`

## 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

- 8.6 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.012, the 67th percentile, on 5 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 30 Sept 2022. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-r48r-j8fx-mq2c](https://github.com/advisories/GHSA-r48r-j8fx-mq2c)
- [OSV: GHSA-r48r-j8fx-mq2c](https://osv.dev/vulnerability/GHSA-r48r-j8fx-mq2c)
- <https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-r48r-j8fx-mq2c>
- <https://nvd.nist.gov/vuln/detail/CVE-2022-39251>
- <https://github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359be76>
- <https://github.com/matrix-org/matrix-js-sdk>
- <https://github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0>
- <https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients>
- <https://security.gentoo.org/glsa/202210-35>

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-r48r-j8fx-mq2c>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-r48r-j8fx-mq2c/>. Everything for agents: <https://agentprime.io/llms.txt>.