CVE-2023-42450 - CVE House

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Status published Medium CVE-2023-42450

Mastodon Server-Side Request Forgery vulnerability

5.4 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from mastodon

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Mastodon Error Handling Discrepancy Enables Private Status Existence Enumeration

Mastodon quotes control can be bypassed

Mastadon streaming server allows OAuth clients without the `read` scope to subscribe to public channels

Mastodon streaming API fails to disconnect disabled and suspended users

Mastodon allows continued access after password reset via CLI

Affected Vendor

mastodon

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Affected Software

mastodon

Vulnerable Versions:

>= 4.2.0-beta1, < 4.2.0-rc2

Timeline

Official Publish: September 19th, 2023

Last Modified: June 18th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-918 CWE-113

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1213 Data from Information Repositories

T1005 Data from Local System

T1046 Network Service Discovery