cve.bz

CVE-2021-21320

4.3 mediumEPSS 0.9%

Medium (4.3) in matrix-react-sdk project matrix-react-sdk. EPSS 0.9% chance of exploitation in the next 30 days. Fixed in matrix-react-sdk 3.15.0.

matrix-react-sdk is an npm package which is a Matrix SDK for React Javascript. In matrix-react-sdk before version 3.15.0, the user content sandbox can be abused to trick users into opening unexpected documents. The content is opened with a `blob` origin that cannot access Matrix user data, so messages and secrets are not at risk. This has been fixed in version 3.15.0.

Severity

CVSS 3.1

4.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS
0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
CWE
CWE-345
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-52mq-6jcv-j79xnpmmatrix-react-sdk<3.15.03.15.0

References

Check your stackJSON