High 7.5Published Aug 10, 2026

CVE-2026-72915Mastodon: Personally-identifying information disclosure due to incorrect access control validation

Updated under an hour ago (2026-10-19 06:30 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mastodon mastodon mastodon:mastodon (from the name)	from 4.6.0-beta.1, < 4.6.4	CNA record

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfjx-refsource-confirm
https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074x-refsource-misc
https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373bx-refsource-misc
https://github.com/mastodon/mastodon/releases/tag/v4.6.4x-refsource-misc
https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.