Vulnerability advisory

GHSA-mwq8-fjpf-c2gr

Prototype pollution in matrix-js-sdk (part 2)

Published Mar 30, 2023Updated Sep 10, 2026OSV record ↗

Also known as CVE-2023-28427

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Affected versions

matrix-js-sdk npm

All matrix-js-sdk advisories →

Affected	Fixed in
All versions before 24.0.0	`24.0.0`Advisories →

Description

Impact

In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the Object.prototype, disrupting matrix-js-sdk functionality, causing denial of service and potentially affecting program logic.

(This is part 2, where CVE-2022-36059 / GHSA-rfv9-x7hh-xc32 is part 1. Part 2 covers remaining vectors not covered by part 1, found in a codebase audit scheduled after part 1.)

Patches

The issue has been patched in matrix-js-sdk 24.0.0.

Workarounds

None.

References

Release blog post
The advisory GHSA-rfv9-x7hh-xc32 (CVE-2022-36059) refers to an initial set of vulnerable locations discovered and patched in matrix-js-sdk 19.4.0. We opted not to disclose that advisory while we performed an audit of the codebase and are now disclosing it jointly with this one.

For more information

If you have any questions or comments about this advisory please email us at security at matrix.org.