What’s Vulnerable › Vulnerabilities

CVE-2023-28427: Prototype pollution in matrix-js-sdk

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-28 · updated 2026-06-17
• Weakness: CWE-1321

Description

matrix-js-sdk is a Matrix messaging protocol Client-Server SDK for JavaScript. In versions prior to 24.0.0 events sent with special strings in key places can temporarily disrupt or impede the matrix-js-sdk from functioning properly, potentially impacting the consumer's ability to process data safely. Note that the matrix-js-sdk can appear to be operating normally but be excluding or corrupting runtime data presented to the consumer. This vulnerability is distinct from GHSA-rfv9-x7hh-xc32 which covers a similar issue. The issue has been patched in matrix-js-sdk 24.0.0 and users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• matrix-org matrix-js-sdk: before 24.0.0 — fixed in 24.0.0

How to fix

Upgrade to a fixed version: matrix-org matrix-js-sdk 24.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-mwq8-fjpf-c2gr
• https://lists.debian.org/debian-lts-announce/2023/04/msg00027.html
• https://matrix.org/blog/2023/03/28/security-releases-matrix-js-sdk-24-0-0-and-matrix-react-sdk-3-69-0
• https://security.gentoo.org/glsa/202305-36
• https://www.debian.org/security/2023/dsa-5392
• https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-mwq8-fjpf-c2gr
• https://lists.debian.org/debian-lts-announce/2023/04/msg00027.html
• https://matrix.org/blog/2023/03/28/security-releases-matrix-js-sdk-24-0-0-and-matrix-react-sdk-3-69-0
• https://security.gentoo.org/glsa/202305-36
• https://www.debian.org/security/2023/dsa-5392

Get alerted when CVE-2023-28427 or the next vulnerability affects your stack