Medium 4.3Published Oct 21, 2025

CVE-2025-62605Mastodon quotes control can be bypassed

Updated under an hour ago (Oct 27, 2026, 11:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for mastodon

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-754
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mastodon mastodon mastodon:mastodon (from the name)	from 4.4.0-beta.1, < 4.4.8; = 4.5.0-beta.1	CNA record
joinmastodon mastodon joinmastodon:mastodon	from 4.4.0 before 4.4.8; 4.5.0	NVD

References

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6	x-refsource-confirm, vendor-advisory
https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e	x-refsource-misc, patch
https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789	x-refsource-misc, patch
https://github.com/mastodon/mastodon/releases/tag/v4.4.8	x-refsource-misc, release-notes
https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.