CVE-2023-28357

4.3 mediumEPSS 0.4%

Medium (4.3) in rocket.chat rocket.chat. EPSS 0.4% chance of exploitation in the next 30 days.

A vulnerability has been identified in Rocket.Chat, where the ACL checks in the Slash Command /mute occur after checking whether a user is a member of a given channel, leaking private channel members to unauthorized users. This allows authenticated users to enumerate whether a username is a member of a channel that they do not have access to.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
CWEs: CWE-200, CWE-863
Published: 2023-05-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

rocket.chat:rocket.chat

References

https://hackerone.com/reports/1445810
https://hackerone.com/reports/1445810

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