CVE-2026-72915
The exposed data included the other user's current email address and last-used IP address.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 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-beta.1.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.28% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Source
- security-advisories@github.com
References
- https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074
- https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b
- https://github.com/mastodon/mastodon/releases/tag/v4.6.4
- https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1
- https://github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfj
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.