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.
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Affected Vendors & Products
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Solution
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History
Tue, 21 Oct 2025 18:15:00 +0000
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Tue, 21 Oct 2025 17:00:00 +0000
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Description | 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. | |
Title | Mastodon quotes control can be bypassed | |
Weaknesses | CWE-754 | |
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Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-10-21T18:00:16.343Z
Reserved: 2025-10-16T19:24:37.267Z
Link: CVE-2025-62605

Updated: 2025-10-21T18:00:13.183Z

Status : Awaiting Analysis
Published: 2025-10-21T17:15:41.203
Modified: 2025-10-21T19:31:25.450
Link: CVE-2025-62605

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