CVE-2025-62605

MEDIUM EPSS 17.1%
Published Oct 21, 20258mo ago · Modified Jun 17, 20261w ago
4.3 CVSS 3.1
Medium
Find Similar
Published Oct 21, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.3
Exploitability
2.8
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
17.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-754

Affected Products 2

VendorProductVersionRange
joinmastodonmastodon*≥4.4.0  –  <4.4.8
joinmastodonmastodon4.5.0any

References 5

  • github.com https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e
    Patch
  • github.com https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789
    Patch
  • github.com https://github.com/mastodon/mastodon/releases/tag/v4.4.8
    Release Notes
  • github.com https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2
    Release Notes
  • github.com https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6
    Vendor Advisory

Remediation

  • github.com https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e
    Patch
  • github.com https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789
    Patch