What is CVE-2024-39777?

CVE-2024-39777 is a high-severity vulnerability in Mattermost, classified under Improper Access Control. CVSS score: 8.7/10. Published 2024-08-01.

How severe is CVE-2024-39777?

High severity. CVSS v3 base score is 8.7 out of 10.

Is CVE-2024-39777 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mattermost

CVE-2024-39777

Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5 and 9.8.x <= 9.8.1 fail to disallow unsolicited invites to expose access to local channels, when shared channels are enabled, which allows a malicious remote to send an invite with the ID of an existing local channel, and that local channel will then become shared without the consent of the local admin.

EPSS: 0.004 (28.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N.

Affected products

Mattermost — versions 9.9.0, 9.5.0, 9.7.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2024-39777?: CVE-2024-39777 is a high-severity vulnerability in Mattermost, classified under Improper Access Control. CVSS score: 8.7/10. Published 2024-08-01.
How severe is CVE-2024-39777?: High severity. CVSS v3 base score is 8.7 out of 10.
Is CVE-2024-39777 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.