CVE-2023-5522 Mobile app freezes when receiving a post with hundreds of emojis
An attacker can freeze the Mattermost mobile app by sending posts with excessive emojis, causing a denial of service for users viewing the channel.
- 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-2023-5522?
CVE-2023-5522 is a medium-severity denial of service vulnerability in Mattermost Mattermost, published on 17 Oct 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost Mobile fails to limit the maximum number of Markdown elements in a post allowing an attacker to send a post with hundreds of emojis to a channel and freeze the mobile app of users when viewing that particular channel.
Weakness: CWE-400
Which versions are affected by CVE-2023-5522?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2023-5522?
No fix has been published for CVE-2023-5522 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-5522 being exploited?
There is no known exploitation of CVE-2023-5522 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-2w9p-mj8f-374x.