BIT-mastodon-2026-22246

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-22246.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-mastodon-2026-22246
Aliases
Published
2026-01-13T11:27:33.626Z
Modified
2026-01-13T12:11:13.036542Z
Summary
Local Mastodon users can enumerate and access severed relationships of every other local user
Details

Mastodon is a free, open-source social network server based on ActivityPub. Mastodon 4.3 added notifications of severed relationships, allowing end-users to inspect the relationships they lost as the result of a moderation action. The code allowing users to download lists of severed relationships for a particular event fails to check the owner of the list before returning the lost relationships. Any registered local user can access the list of lost followers and followed users caused by any severance event, and go through all severance events this way. The leaked information does not include the name of the account which has lost follows and followers. This has been fixed in Mastodon v4.3.17, v4.4.11 and v4.5.4.

Database specific 
{
    "severity": "Medium",
    "cpes": [
        "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*"
    ]
}
References

Affected packages

Bitnami / mastodon

Package

Name
mastodon
Purl
pkg:bitnami/mastodon

Severity

  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.17
Introduced
4.4.0
Fixed
4.4.11
Introduced
4.5.0
Fixed
4.5.4

Database specific

source

"https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-22246.json"