CVE-2025-54879
- Source
- https://cve.org/CVERecord?id=CVE-2025-54879
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-54879.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-54879
- Aliases
-
- BIT-mastodon-2025-54879
- GHSA-84ch-6436-c7mg
- Published
- 2025-08-05T23:39:59.130Z
- Modified
- 2026-07-15T01:49:21.891766815Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Mastodon e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails
- Details
-
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 the confirmation path, effectively disabling per-email limits for confirmation requests. This allows attackers to bypass rate limits by rotating IP addresses and send unlimited confirmation emails to any email address, as only a weak IP-based throttle (25 requests per 5 minutes) remains active. The vulnerability enables denial-of-service attacks that can overwhelm mail queues and facilitate user harassment through confirmation email spam. This is fixed in versions 4.2.24, 4.3.11 and 4.4.3.
- Database specific
{ "cwe_ids": [ "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54879.json", "cna_assigner": "GitHub_M" }- References
-
- https://github.com/mastodon/mastodon/releases/tag/v4.4.3
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54879.json
- https://github.com/mastodon/mastodon/security/advisories/GHSA-84ch-6436-c7mg
- https://nvd.nist.gov/vuln/detail/CVE-2025-54879
- https://github.com/mastodon/mastodon/commit/e2592419d93fb41be03c2f3ff6a122fecb0e0952
Affected packages
Git / github.com/mastodon/mastodon
Affected ranges
- Type
- GIT
- Repo
- https://github.com/mastodon/mastodon
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedFixed
- Database specific
{ "cpe": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "3.1.5" }, { "fixed": "4.2.24" }, { "introduced": "4.3.0" }, { "fixed": "4.3.11" }, { "introduced": "4.4.0" }, { "fixed": "4.4.3" } ], "source": [ "CPE_RANGE", "REFERENCES" ] }