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CVE-2025-27157: Mastodon's rate-limits are missing on `/auth/setup`

5.3 CVSS

Description

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.

Classification

CVE ID: CVE-2025-27157

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.3

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types

CWE-770: Allocation of Resources Without Limits or Throttling

Affected Products

Vendor: mastodon

Product: mastodon

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 13.61% (scored less or equal to compared to others)

EPSS Date: 2025-03-28 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-27157
https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h
https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec

Timeline