SB2024021712 - Input validation error in Mastodon

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Main Vulnerability Database SB2024021712

SB2024021712 - Input validation error in Mastodon

Published: February 17, 2024 Updated: April 23, 2026

Security Bulletin ID SB2024021712
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Input validation error (CVE-ID: CVE-2024-25623)

The vulnerability allows a remote user to impersonate remote accounts.

The vulnerability exists due to improper input validation in FetchRemoteStatusService when fetching remote statuses. A remote user can upload a crafted Activity Streams document to a remote server and make a Mastodon server fetch it to impersonate remote accounts.

Exploitation requires a remote server that allows account registration, accepts arbitrary user-uploaded documents on the same domain as ActivityPub actors, and serves those documents in response to requests for Activity Streams media types.


Remediation

Install update from vendor's website.

References