Mastodon: Personally-identifying information disclosure due to incorrect access control validation
Mastodon is a free, open-source social network server based on ActivityPub. From 4.6.0 until 4.6.4 and 4.7.0, any logged-in local user could use the show action in app/controllers/admin/collections_controller.rb to access personally identifying information about another local user in a collection because the controller used the general collection policy instead of the admin collection policy namespace. The exposed data included the other user's current email address and last-used IP address. This issue is fixed in versions 4.6.4 and 4.7.0.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-72915US | — | — | ||
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 ap… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074WEB
- https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373bWEB
- https://github.com/mastodon/mastodon/releases/tag/v4.6.4WEB
- https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1WEB
- https://github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfjWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-72915WEB
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan