4.3

CVE-2021-21320: matrix-org matrix-react-sdk

CVSS: 4.3v3.1MediumModified
AliasesGHSA-52mq-6jcv-j79x
Published 02-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-21320 is a medium (CVSS 4.3) vulnerability in matrix-org matrix-react-sdk. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.7% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.92%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.92%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

0.00 pp

From 0.92% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.92%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Matrix-org1 product
Matrix-react-sdk_project1 product
Npm1 product
  • matrix-react-sdk< 3.15.0

3 vendors · 3 products

References

5 links