Low severity3.7NVD Advisory· Published Sep 22, 2021· Updated Jun 17, 2026

CVE-2021-37860

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
github.com/mattermost/mattermost-server/v5Go	< 5.39.0	5.39.0

Affected products

Mattermost/Mattermost2 versions
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*range: <=5.38
- (no CPE)range: unspecified
ghsa-coords
pkg:golang/github.com/mattermost/mattermost-server/v5
Range: < 5.39.0

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-hv5f-73mr-7vvjghsaADVISORY
mattermost.com/security-updates/nvdVendor Advisory
nvd.nist.gov/vuln/detail/CVE-2021-37860ghsaADVISORY
docs.mattermost.com/install/self-managed-changelog.htmlghsaWEB
mattermost.com/security-updatesghsaWEB

News mentions

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cvss	0.240
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000