Information disclosure in Mastodon

CVE-2026-72915

Mastodon is a free, open-source social network server based on ActivityPub. From 4.6.0-beta.1 until 4.6.4 and 4.7.0-beta.1, any logged-in local user could use the show action in app/controllers/admin/collections_controller.rb to access per…

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

  • Mastodon — versions >= 4.6.0-beta.1, < 4.6.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-72915?
CVE-2026-72915 is a high-severity vulnerability in Mastodon, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-08-10.
How severe is CVE-2026-72915?
High severity. CVSS v3 base score is 7.5 out of 10.