CVE-2023-2808 Lack of URL normalization allows rendering previews for disallowed domains
Attackers can bypass domain restrictions to trigger link previews on disallowed domains by using UTF confusable characters in URLs.
- 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-2023-2808?
CVE-2023-2808 is a medium-severity vulnerability in Mattermost Mattermost, published on 29 May 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Mattermost fails to normalize UTF confusable characters when determining if a preview should be generated for a hyperlink, allowing an attacker to trigger link preview on a disallowed domain using a specially crafted link.
Weakness: CWE-20
Which versions are affected by CVE-2023-2808?
It affects 1 product.
Products include Mattermost Mattermost.
How do I fix CVE-2023-2808?
No fix has been published for CVE-2023-2808 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-2808 being exploited?
There is no known exploitation of CVE-2023-2808 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-vc9q-cghx-53cj.