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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72915
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 22:17:10 UTC
Updated2026-08-10 22:17:10 UTC
DescriptionMastodon 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mastodon Mastodon affected >= 4.6.0-beta.1, < 4.6.4 Not specified

References

ReferenceSourceLinkTags
github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83... [email protected] github.com
github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb... [email protected] github.com
github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfj [email protected] github.com
github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1 [email protected] github.com
github.com/mastodon/mastodon/releases/tag/v4.6.4 [email protected] github.com
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