6.1

CVE-2021-37860: mattermost Cross-site Scripting

CVSS: 6.1v3.1MediumModified
AliasesGHSA-hv5f-73mr-7vvjGO-2022-0604
Published 22-09-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-37860 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in mattermost. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.3% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
0.63%
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. 22-09-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Mattermost 5.38 and earlier fails to sufficiently sanitize clipboard contents, which allows a user-assisted attacker to inject arbitrary web script in product deployments that explicitly disable the default CSP.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

0.00 pp

From 0.63% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.63%

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

Github.com/mattermost1 product
  • mattermost-serverAll versions (No fix recorded)
Github.com/mattermost/mattermost-server1 product
  • v5< 5.39.0
Mattermost1 product

3 vendors · 3 products

References

6 links