How severe is CVE-2024-42347?

CVE-2024-42347 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-42347 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-42347?

CVE-2024-42347 affects Matrix Matrix-react-sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-42347?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-42347 have an EU (EUVD) identifier?

Yes. CVE-2024-42347 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2571.

When was CVE-2024-42347 published?

CVE-2024-42347 was published on 2024-08-06 and last updated on 2026-06-17.

CVE-2024-42347

CVE-2024-42347 is a high-severity vulnerability in Matrix Matrix-react-sdk with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-359.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-2571
Weakness: CWE-359
Affected product: Matrix Matrix-react-sdk
Published: 2024-08-06
Last modified: 2026-06-17

Description

matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. A malicious homeserver could manipulate a user's account data to cause the client to enable URL previews in end-to-end encrypted rooms, in which case any URLs in encrypted messages would be sent to the server. This was patched in matrix-react-sdk 3.105.0. Deployments that trust their homeservers, as well as closed federations of trusted servers, are not affected. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Frequently asked questions

What is CVE-2024-42347?: matrix-react-sdk is a react-based SDK for inserting a Matrix chat/voip client into a web page. A malicious homeserver could manipulate a user's account data to cause the client to enable URL previews in end-to-end encrypted rooms, in which case any URLs in encrypted messages would be sent to the server. This was patched in matrix-react-sdk 3.105.0. Deployments that trust their homeservers, as well as closed federations of trusted servers, are not affected. Users are advised to upgrade. There are no known workarounds for this vulnerability.
How severe is CVE-2024-42347?: CVE-2024-42347 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-42347 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-42347?: CVE-2024-42347 affects Matrix Matrix-react-sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-42347?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-42347 have an EU (EUVD) identifier?: Yes. CVE-2024-42347 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2571.
When was CVE-2024-42347 published?: CVE-2024-42347 was published on 2024-08-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:matrix:matrix-react-sdk:*:*:*:*:*:*:*:*

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