What is CVE-2022-39236?

CVE-2022-39236 is a medium-severity vulnerability in Matrix JavaScript Sdk, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2022-09-28.

How severe is CVE-2022-39236?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Is CVE-2022-39236 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Matrix JavaScript Sdk

CVE-2022-39236

Matrix Javascript SDK is the Matrix Client-Server SDK for JavaScript. Starting with version 17.1.0-rc.1, improperly formed beacon events can 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 is patched in matrix-js-sdk v19.7.0. Redacting applicable events, waiting for the sync processor to store data, and restarting the client are possible workarounds. Alternatively, redacting the applicable events and clearing all storage will fix the further perceived issues. Downgrading to an unaffected version, noting that such a version may be subject to other vulnerabilities, will additionally resolve the issue.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-09-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.014 (70.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.014 · change: +0.003

Affected products

Matrix JavaScript Sdk — versions 17.1.0
Matrix-Org Matrix-Js-Sdk — versions >= 17.1.0-rc.1, < 19.7.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

karimhabush/cyberowl

References

github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-hvv8-5v86-r45x (Third Party Advisory)
github.com/matrix-org/matrix-spec-proposals/pull/3488 (Patch, Third Party Advisory)
github.com/matrix-org/matrix-js-sdk/commit/a587d7c36026fe1fcf93dfff63588abee359… (Patch, Third Party Advisory)
github.com/matrix-org/matrix-js-sdk/releases/tag/v19.7.0 (Third Party Advisory, Release Notes)
security.gentoo.org/glsa/202210-35 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2022-39236?: CVE-2022-39236 is a medium-severity vulnerability in Matrix JavaScript Sdk, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2022-09-28.
How severe is CVE-2022-39236?: Medium severity. CVSS v3 base score is 4.3 out of 10.
Is CVE-2022-39236 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.