UpHeron
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Servers and applications

CVE-2025-54879

Mastodon confirmation e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails

Severity
High 7.5
Published
5 Aug 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.2.24, 4.3.11, 4.4.3
Also known as
GHSA-84ch-6436-c7mg
Sources
NVD, Project advisories (GitHub)

Description

Mastodon is a free, open-source social network server based on ActivityPub Mastodon which facilitates LDAP configuration for authentication. In versions 3.1.5 through 4.2.24, 4.3.0 through 4.3.11 and 4.4.0 through 4.4.3, Mastodon's rate-limiting system has a critical configuration error where the email-based throttle for confirmation emails incorrectly checks the password reset path instead of…

Affected software

SoftwareAffected versions
MastodonServers and applications · cpe:a:joinmastodon:mastodon
  • From 3.1.5 before 4.2.24
  • From 4.3.0 before 4.3.11
  • From 4.4.0 before 4.4.3
MastodonServers and applications · github:mastodon/mastodon
  • From 3.1.5 before 4.2.24

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-54879
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-54879
  • GitHub Advisory Database https://github.com/advisories/GHSA-84ch-6436-c7mg
  • github.com https://github.com/mastodon/mastodon/security/advisories/GHSA-84ch-6436-c7mg