CVE-2023-42450 MEDIUM

CVE-2023-42450: Mastodon Server-Side Request Forgery vulnerability

Vendor Mastodon
Product mastodon
Weakness CWE-918 · SSRF
Published September 19, 2023
Last update June 18, 2025
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.

Key dates

02Disclosure timeline

September 19, 2023 CVE published
June 18, 2025 Record updated