CVE-2025-62605
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-21

Last updated on: 2025-12-12

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2025-10-21
Last Modified
2025-12-12
Generated
2026-06-16
AI Q&A
2025-10-21
EPSS Evaluated
2026-06-15
NVD
CVE-2025-62605
EUVD
EUVD-2025-35213
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
joinmastodon mastodon From 4.4.0 (inc) to 4.4.8 (exc)
joinmastodon mastodon 4.5.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-754 The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
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Executive Summary

This vulnerability in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2 allows an attacker to bypass quote controls by reblogging any post and then quoting their own reblog. Since Mastodon treats reblogs as statuses without special handling, the attacker can quote themselves but display a preview of the original post they were not authorized to quote, circumventing the intended quote restrictions.

Impact Analysis

An attacker exploiting this vulnerability could display unauthorized previews of posts by bypassing quote controls, potentially exposing content that should be restricted or controlled. This could lead to unintended information disclosure or misuse of content within the Mastodon social network.

Mitigation Strategies

Upgrade Mastodon to version 4.4.8 or later, or to version 4.5.0-beta.2 or later, as these versions contain patches that fix the vulnerability allowing quote control bypass.

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