CVE-2025-62605: Mastodon quotes control can be bypassed
Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2. Mastodon internally treats reblogs as statuses. Since they were not special-treated, an attacker could reblog any post, then quote their reblog, technically quoting themselves, but having the quote feature a preview of the post they did not get authorization for with all of the affordances that would be otherwise denied by the quote controls. This issue has been patched in versions 4.4.8 and 4.5.0-beta.2.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the vulnerability type of CVE-2025-62605?
CVE-2025-62605 is a security vulnerability in Mastodon that allows attackers to bypass verifiable quote post controls.
What versions of Mastodon are affected by CVE-2025-62605?
CVE-2025-62605 affects Mastodon versions prior to 4.4.8 and 4.5.0-beta.2.
How do I fix CVE-2025-62605?
To fix CVE-2025-62605, upgrade your Mastodon installation to version 4.4.8 or later.
What risks does CVE-2025-62605 pose to users?
CVE-2025-62605 poses a risk of unauthorized manipulation of quote posts, undermining the integrity of shared content.
Is CVE-2025-62605 related to privacy concerns?
Yes, CVE-2025-62605 can lead to privacy concerns as it allows malicious users to compromise the verifiability of posts.