CVE-2024-21848

LOWNVD 3.13.1—

3.1

Improper Access Control in Mattermost Server versions 8.1.x before 8.1.11 allows an attacker that is in a channel with an active call to keep participating in the call even if they are removed from the channel

CVSS v3: 3.1
EG Score: 3.1(medium)
EPSS: 45.7%
KEV: Not listed

Published

April 5, 2024

Last Modified

December 13, 2024

References (2)

responsibledisclosure@mattermosthttps://mattermost.com/security-updates
af854a3a-2127-422b-91ae-364da2661108https://mattermost.com/security-updates

Affected Packages

(4 across 1 ecosystem)

Go(4)

Package	Vulnerable range	Fixed in	Dependents
github.com/mattermost/mattermost-server	—	—	—
github.com/mattermost/mattermost-server/v5	—	—	—
github.com/mattermost/mattermost-server/v6	—	—	—
github.com/mattermost/mattermost/server/v8	—	—	—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 05:09 UTCEG score recompute

Frequently asked(5)

What is CVE-2024-21848?

CVE-2024-21848 is a low vulnerability published on April 5, 2024. Improper Access Control in Mattermost Server versions 8.1.x before 8.1.11 allows an attacker that is in a channel with an active call to keep participating in the call even if they are removed from the channel

When was CVE-2024-21848 disclosed?

CVE-2024-21848 was first published in the National Vulnerability Database on April 5, 2024, with the most recent update on December 13, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-21848 actively exploited?

CVE-2024-21848 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-21848?

CVE-2024-21848 has a CVSS v3 base score of 3.1 (NVD).

How do I remediate CVE-2024-21848?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-21848, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-21848

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Is Your Infrastructure Affected by CVE-2024-21848?

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