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Vulnerability record · CVE-2026-72915 · published 10 August 2026

CVE-2026-72915: Information exposure vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.48% · top 60.8% CWE-200 · Information exposure Deferred
7.5CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
9 Sep 2026Last modified by NVD

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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-72915), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.