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Not in CISA KEV
HIGH severity

HTML injection in search results via plaintext message highlightingGHSA-xv83-x443-7rmw

HIGHFix: matrix-org/matrix-react-sdk@bf182bc

GHSA-xv83-x443-7rmw is a high-severity (CVSS 8.2) CWE-74 vulnerability in matrix-react-sdk. A fix is available for matrix-react-sdk — see the affected versions and patch details below.

Also known asCVE-2023-30609
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-xv83-x443-7rmw.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk
0.07%0.60%1.13%1.65%1.2%0.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

3other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
matrix-react-sdknpm
13Kdownloads / week

Description

Impact

Plain text messages containing HTML tags are rendered as HTML in the search results. To exploit this, an attacker needs to trick a user into searching for a specific message containing an HTML injection payload.

Cross-site scripting is possible by including resources from recaptcha.net and gstatic.com which are included in the default CSP.

Thanks to Cadence Ember for finding the injection and to S1m for finding possible XSS vectors.

Patches

Version 3.71.0 of the SDK fixes the issue.

Workarounds

Restarting the client will clear the injection.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmatrix-react-sdkall versions3.71.0npm install matrix-react-sdk@3.71.0

Affected Products

1 product · 1 configurations
Application
matrix-react-sdkmatrix-react-sdk_project
< 3.71.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for matrix-react-sdk, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update matrix-react-sdk to 3.71.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xv83-x443-7rmw is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact Plain text messages containing HTML tags are rendered as HTML in the search results. To exploit this, an attacker needs to trick a user into searching for a specific message containing an HTML injection payload. Cross-site scripting is possible by including resources from `recaptcha.net` and `gstatic.com` which are included in the default CSP. Thanks to [Cadence Ember](https://cadence.moe/) for finding the injection and to [S1m](https://github.com/p1gp1g/) for finding possible XSS vectors. ### Patches Version 3.71.0 of the SDK fixes the issue. ### Workarounds Restarting the clie
O3 Security · Impact-Aware SCA

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HTML injection in search results via plaintext message…