CVE-2026-33869
MEDIUM4.8EPSS 0.08%Mastodon has a denial of service for quote authorization
Published: 3/31/2026Modified: 4/2/2026
Description
Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The vulnerability has been patched in Mastodon 4.5.8 and 4.4.15. Mastodon 4.3 and earlier are not affected because they do not support quotes.
Affected packages (1)
- Bitnami/mastodon>= 4.4.0, < 4.4.15, >= 4.5.0, < 4.5.8
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |