CVE-2024-31859

MEDIUMNVD 4.34.3—

4.3

Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1 and 8.1.x <= 8.1.12 fail to perform proper authorization checks which allows a member running a playbook in an existing channel to be promoted to a channel admin

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 28.8%
KEV: Not listed

Published

May 26, 2024

Last Modified

September 30, 2025

References (2)

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

Weakness Classification(1)

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

CWE-284Improper Access Control

Data Freshness Timeline

(refreshed 16× in last 7d / 20× 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.

2026-06-05 22:46 UTCepss_batch
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Frequently asked(5)

What is CVE-2024-31859?

CVE-2024-31859 is a medium vulnerability published on May 26, 2024. Mattermost versions 9.5.x <= 9.5.3, 9.6.x <= 9.6.1 and 8.1.x <= 8.1.12 fail to perform proper authorization checks which allows a member running a playbook in an existing channel to be promoted to a channel admin

When was CVE-2024-31859 disclosed?

CVE-2024-31859 was first published in the National Vulnerability Database on May 26, 2024, with the most recent update on September 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-31859 actively exploited?

CVE-2024-31859 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-31859?

CVE-2024-31859 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2024-31859?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-31859, 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

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CVE-2024-31859

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2024-31859?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)