CVE-2025-62605
Mastodon quotes control can be bypassed
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.
INFO
Published Date :
Oct. 21, 2025, 5:15 p.m.
Last Modified :
Oct. 19, 2026, 4:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-62605
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Mastodon to version 4.4.8 or later.
- Update Mastodon to version 4.5.0-beta.2 or later.
- Verify quote controls are functioning correctly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-62605.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-62605 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-62605
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-62605 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-62605 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 19, 2026
Action Type Old Value New Value Added Translation Title: Mastodon, Description: Mastodon es un servidor de red social gratuito y de código abierto basado en ActivityPub. En la versión 4.4 de Mastodon, se añadió soporte para publicaciones de citas verificables con controles de cita, pero es posible que un atacante omita estos controles en versiones de Mastodon anteriores a la 4.4.8 y 4.5.0-beta.2. Mastodon trata internamente los reblogs como estados. Dado que no se les dio un tratamiento especial, un atacante podría hacer reblog de cualquier publicación, luego citar su reblog, técnicamente citándose a sí mismo, pero haciendo que la cita muestre una vista previa de la publicación para la que no obtuvo autorización con todas las funcionalidades que de otro modo serían denegadas por los controles de cita. Este problema ha sido parcheado en las versiones 4.4.8 y 4.5.0-beta.2. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'mastodon', 'product': 'mastodon', 'versions': [{'status': 'affected', 'version': '>= 4.4.0-beta.1, < 4.4.8'}, {'status': 'affected', 'version': '= 4.5.0-beta.1'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-62605', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-10-21T17:59:52.795175Z'} -
Initial Analysis by [email protected]
Dec. 12, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* versions from (including) 4.4.0 up to (excluding) 4.4.8 *cpe:2.3:a:joinmastodon:mastodon:4.5.0:beta1:*:*:*:*:*:* Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/releases/tag/v4.4.8 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6 Types: Vendor Advisory -
New CVE Received by [email protected]
Oct. 21, 2025
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-754 Added Reference https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e Added Reference https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789 Added Reference https://github.com/mastodon/mastodon/releases/tag/v4.4.8 Added Reference https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2 Added Reference https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6