CVE-2025-67500
Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration
Description
Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3.
INFO
Published Date :
Dec. 10, 2025, 12:16 a.m.
Last Modified :
Oct. 14, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-67500
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 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | MITRE-CVE | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Update Mastodon to version 4.2.28 or later.
- Update Mastodon to version 4.3.15 or later.
- Update Mastodon to version 4.4.10 or later.
- Update Mastodon to version 4.5.3 or later.
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-2025-67500.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-67500 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-2025-67500
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-2025-67500 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-67500 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. 14, 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. Las versiones 4.2.27 y anteriores, 4.3.0-beta.1 hasta 4.3.14, 4.4.0-beta.1 hasta 4.4.9, 4.5.0-beta.1 hasta 4.5.2 tienen discrepancias en el manejo de errores que permiten verificar si un estado dado existe enviando una solicitud con un encabezado Accept-Language no inglés. Usando este comportamiento, un atacante que conoce el identificador de un estado particular que no tiene permitido ver puede confirmar si este estado existe o no. Esto no puede usarse para conocer el contenido del estado o cualquier otra propiedad además de su existencia. Este problema está solucionado en las versiones 4.2.28, 4.3.15, 4.4.10 y 4.5.3. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'mastodon', 'product': 'mastodon', 'versions': [{'status': 'affected', 'version': '< 4.2.28'}, {'status': 'affected', 'version': '>= 4.3.0-beta.1, < 4.3.15'}, {'status': 'affected', 'version': '>= 4.4.0-beta.1, < 4.4.10'}, {'status': 'affected', 'version': '>= 4.5.0-beta.1, < 4.5.3'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-67500', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-12-10T15:42:25.833580Z'} -
Initial Analysis by [email protected]
Dec. 19, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* versions up to (excluding) 4.2.28 *cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* versions from (including) 4.3.0 up to (excluding) 4.3.15 *cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* versions from (including) 4.4.0 up to (excluding) 4.4.10 *cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* versions from (including) 4.5.0 up to (excluding) 4.5.3 Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/pull/37077/commits/9957d3218cb33fea6a44bb285e2ba4795a059e4f Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mastodon/mastodon/security/advisories/GHSA-gwhw-gcjx-72v8 Types: Vendor Advisory -
New CVE Received by [email protected]
Dec. 10, 2025
Action Type Old Value New Value Added Description Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow checking whether a given status exists by sending a request with a non-English Accept-Language header. Using this behavior, an attacker who knows the identifier of a particular status they are not allowed to see can confirm whether this status exists or not. This cannot be used to learn the contents of the status or any other property besides its existence. This issue is fixed in versions 4.2.28, 4.3.15, 4.4.10 and 4.5.3. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-204 Added Reference https://github.com/mastodon/mastodon/pull/37077/commits/9957d3218cb33fea6a44bb285e2ba4795a059e4f Added Reference https://github.com/mastodon/mastodon/security/advisories/GHSA-gwhw-gcjx-72v8