CVE-2023-28357

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.

Categories

4.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.08%
Third-Party Advisory hackerone.com
Affected: n/a Rocket.Chat
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/1445810 issue tracking third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-28357?
CVE-2023-28357 has been scored as a medium severity vulnerability.
How to fix CVE-2023-28357?
To fix CVE-2023-28357, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-28357 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-28357 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-28357?
CVE-2023-28357 affects n/a Rocket.Chat.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.