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CVE-2025-62605

MEDIUM

4.3

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.

CVE Details

CVSS v3.1 Score4.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published10/21/2025

Last Modified12/12/2025

Sourcenvd

Honeypot Sightings0

Affected Products

joinmastodon:mastodon

Weaknesses (CWE)

CWE-754

References

https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e(security-advisories@github.com)

https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789(security-advisories@github.com)

https://github.com/mastodon/mastodon/releases/tag/v4.4.8(security-advisories@github.com)

https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2(security-advisories@github.com)

https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6(security-advisories@github.com)

IOC Correlations

No correlations recorded

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