What’s Vulnerable › Vulnerabilities
CVE-2023-28357
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-05-11 · updated 2026-06-17
- Weakness: CWE-200
Description
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.
Affected products
- Rocket.Chat: before 6.0.0 — fixed in 6.0.0
How to fix
Upgrade to a fixed version: Rocket.Chat 6.0.0. Check the vendor advisory for mitigations.
References
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