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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 12 Dec 2025 22:45:00 +0900

Type Values Removed Values Added
CPEs cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
cpe:2.3:a:joinmastodon:mastodon:4.5.0:beta1:*:*:*:*:*:*

Thu, 23 Oct 2025 19:30:00 +0900

Type Values Removed Values Added
First Time appeared Joinmastodon
Joinmastodon mastodon
Vendors & Products Joinmastodon
Joinmastodon mastodon

Wed, 22 Oct 2025 03:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 22 Oct 2025 02:00:00 +0900

Type Values Removed Values Added
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
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-10-21T18:00:16.343Z

Reserved: 2025-10-16T19:24:37.267Z

Link: CVE-2025-62605

cve-icon Vulnrichment

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

cve-icon NVD

Status : Analyzed

Published: 2025-10-21T17:15:41.203

Modified: 2025-12-12T13:39:29.430

Link: CVE-2025-62605

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-10-23T19:12:49Z

Weaknesses