CVE-2023-2787 Collapsed Reply Threads APIs leak message contents from private channels
Attackers can read private channel messages via the threads API due to missing membership checks in Mattermost.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-2787?
CVE-2023-2787 is a medium-severity missing authorization vulnerability in Mattermost Mattermost, published on 16 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.
Weakness: CWE-862
Which versions are affected by CVE-2023-2787?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2023-2787?
No fix has been published for CVE-2023-2787 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-2023-2787 being exploited?
There is no known exploitation of CVE-2023-2787 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-8m2w-p6c5-hh6c.