CVE-2026-72915

HIGH 7.5

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

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	mastodon
Product	mastodon
Published	Aug 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

mastodon / mastodon

>= 4.6.0-beta.1, < 4.6.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfj github.com: https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074 github.com: https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b github.com: https://github.com/mastodon/mastodon/releases/tag/v4.6.4 github.com: https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1