Missing Rate Limits in Mastodon's Authentication Setup Process
CVE-2025-27157

5.3MEDIUM

Key Information:

Vendor

Mastodon

Status
Mastodon
Vendor
CVE Published:
27 February 2025

What is CVE-2025-27157?

Mastodon, a self-hosted federated microblogging platform, is affected by a vulnerability due to the absence of rate limits on the /auth/setup endpoint. This flaw allows an attacker to manipulate requests and send emails to arbitrary addresses, potentially leading to misuse of the email notification system. The issue has been rectified in versions 4.2.16 and 4.3.4, reinforcing the need for users to promptly update their installations to ensure email functionalities are secured against unauthorized use.

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Deploy the Patch

Affected Version(s)

mastodon >= 4.2.0, < 4.2.16 < 4.2.0, 4.2.16

mastodon >= 4.3.0, < 4.3.4 < 4.3.0, 4.3.4

References

https://github.com/mastodon/mastodon/security/advisories/...
x_refsource_CONFIRM
https://github.com/mastodon/mastodon/commit/06f879ce9bea1...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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