CVE-2021-37864 Users can view the contents of an archived channel when access is explicitly denied by the system admin
Authenticated users can bypass admin restrictions to view contents of archived channels in Mattermost by directly accessing APIs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-37864?
CVE-2021-37864 is a low-severity missing authorization vulnerability in Mattermost Mattermost, published on 18 Jan 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.
Which versions are affected by CVE-2021-37864?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2021-37864?
No fix has been published for CVE-2021-37864 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-37864 being exploited?
There is no known exploitation of CVE-2021-37864 in the wild and no public exploit code.
Other vulnerabilities in Mattermost Mattermost
- CVE-2019-20851 Path traversal in n/a
- CVE-2024-39274 Malicious remote can add users to arbitrary teams and channels
- CVE-2024-39777 Malicious remote can invite itself to an arbitrary local channel
- CVE-2024-39830 Timing attack during remote cluster token comparison when shared channels are enabled
- CVE-2023-3615 Lack of server certificate validation in websockets connection
Sources
Also known as GHSA-898c-6fq9-5cv9.