CVE-2024-37903: Mastodon has improper authorship check on audience extension for existing posts
Mastodon is a self-hosted, federated microblogging platform. Starting in version 2.6.0 and prior to versions 4.1.18 and 4.2.10, by crafting specific activities, an attacker can extend the audience of a post they do not own to other Mastodon users on a target server, thus gaining access to the contents of a post not intended for them. Versions 4.1.18 and 4.2.10 contain a patch for this issue.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-37903?
CVE-2024-37903 has been classified with a moderate severity level as it allows unauthorized users to extend the audience of posts.
How do I fix CVE-2024-37903?
To fix CVE-2024-37903, upgrade your Mastodon installation to version 4.1.18 or 4.2.10 or later.
Which versions of Mastodon are affected by CVE-2024-37903?
CVE-2024-37903 affects Mastodon versions from 2.6.0 up to 4.1.18 and 4.2.0 up to 4.2.10.
What kind of attacks does CVE-2024-37903 enable?
CVE-2024-37903 allows attackers to improperly extend the audience of a post they do not own, exposing it to unintended users.
Is there a workaround for CVE-2024-37903 before upgrading?
There are no specific workarounds for CVE-2024-37903 recommended; upgrading to a secure version is the best way to mitigate this vulnerability.