CVE-2023-2787

6.5 mediumEPSS 0.5%

Medium (6.5) in mattermost mattermost. EPSS 0.5% chance of exploitation in the next 30 days.

Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.

Severity

CVSS 3.1

6.5 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
CWE: CWE-862
Published: 2023-06-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mattermost:mattermost

References

https://mattermost.com/security-updates/
https://mattermost.com/security-updates/

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