CVE-2025-27157

Mastodon is a self-hosted, federated microblogging platform. Starting in version 4.2.0 and prior to versions 4.2.16 and 4.3.4, the rate limits are missing on `/auth/setup`. Without those rate limits, an attacker can craft requests that will send an email to an arbitrary addresses. Versions 4.2.16 and 4.3.4 fix the issue.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub_MCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA-ADPADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 29%
VendorProductVersion
joinmastodonmastodon
4.2.0 ≤
𝑥
< 4.2.16
joinmastodonmastodon
4.3.0 ≤
𝑥
< 4.3.4
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec
https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h