CVE-2024-34535: Joinmastodon Mastodon

Medium severity, CVSS 5.9. EPSS: 0.4% chance of exploitation in the next 30 days.

In Mastodon 4.1.6, API endpoint rate limiting can be bypassed by setting a crafted HTTP request header.

Affected products

• Joinmastodon Mastodon: up to and including 4.1.16; from 4.2.0, up to and including 4.2.8

Published 2024-10-03. Last modified 2026-06-17.