CVE-2026-22246

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Source
https://cve.org/CVERecord?id=CVE-2026-22246
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-22246.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-22246
Aliases
  • GHSA-ww85-x9cp-5v24
Published
2026-01-08T15:27:21.490Z
Modified
2026-01-12T02:47:10.411329Z
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
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 
{
    "cwe_ids": [
        "CWE-201"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22246.json"
}
References

Affected packages

Git / github.com/mastodon/mastodon

Affected ranges

Type
GIT
Repo
https://github.com/mastodon/mastodon
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
004f3aa2356e64a463feff26dda3ed41547ed718
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.3.17"
        }
    ]
}
Type
GIT
Repo
https://github.com/mastodon/mastodon
Events
Introduced
12c0e58d9aa80db570fba5fa5146f3a640e99b42
Fixed
ef4d722d6af8e0e9a25e30bb6c33aa0e14f6951f
Database specific 
{
    "versions": [
        {
            "introduced": "4.4.0-beta.1"
        },
        {
            "fixed": "4.4.11"
        }
    ]
}
Type
GIT
Repo
https://github.com/mastodon/mastodon
Events
Introduced
5a8ab0a3e62a8825e28bb74c1760ba6488d20c97
Fixed
55a7b1ea5820b2fa8d754108b6a948d4bd60d98b
Database specific 
{
    "versions": [
        {
            "introduced": "4.5.0-beta.1"
        },
        {
            "fixed": "4.5.4"
        }
    ]
}

Affected versions

v0.*

v0.1.0
v0.1.1
v0.1.2
v0.6
v0.7
v0.8
v0.9
v0.9.9

v1.*

v1.0
v1.1
v1.1.1
v1.1.2
v1.2
v1.2.1
v1.2.2
v1.3
v1.3.1
v1.3.2
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.4.6
v1.4.7
v1.4rc1
v1.4rc2
v1.4rc3
v1.4rc4
v1.4rc5
v1.4rc6
v1.5.0
v1.5.0rc1
v1.5.0rc2
v1.5.0rc3
v1.5.1
v1.6.0
v1.6.0rc1
v1.6.0rc2
v1.6.0rc3
v1.6.0rc4
v1.6.0rc5
v1.6.1

v2.*

v2.0.0
v2.0.0rc1
v2.0.0rc2
v2.0.0rc3
v2.0.0rc4
v2.1.0
v2.1.0rc1
v2.1.0rc2
v2.1.0rc3
v2.1.0rc4
v2.1.0rc5
v2.1.0rc6
v2.1.1
v2.1.2
v2.1.3
v2.2.0
v2.2.0rc1
v2.2.0rc2
v2.3.0
v2.3.0rc1
v2.3.0rc2
v2.3.0rc3
v2.3.1
v2.3.1rc1
v2.3.1rc2
v2.3.1rc3
v2.3.2
v2.3.2rc1
v2.3.2rc2
v2.3.2rc3
v2.3.2rc4
v2.3.2rc5
v2.4.0
v2.4.0rc1
v2.4.0rc2
v2.4.0rc3
v2.4.0rc4
v2.4.0rc5
v2.4.1
v2.4.1rc1
v2.4.1rc2
v2.4.1rc3
v2.4.1rc4
v2.4.2
v2.4.2rc1
v2.4.2rc2
v2.4.2rc3
v2.4.3
v2.4.3rc1
v2.4.3rc2
v2.4.3rc3
v2.5.0
v2.5.0rc1
v2.5.0rc2
v2.6.0
v2.6.0rc1
v2.6.0rc2
v2.6.0rc3
v2.6.0rc4
v2.6.1
v2.7.0
v2.7.0rc1
v2.7.0rc2
v2.7.0rc3
v2.7.1
v2.8.0
v2.8.0rc1
v2.8.0rc2
v2.8.0rc3
v2.8.1
v2.8.2
v2.9.0
v2.9.0rc1
v2.9.0rc2
v2.9.1
v2.9.2

v3.*

v3.0.0
v3.0.0rc1
v3.0.0rc2
v3.0.0rc3
v3.0.1
v3.1.0
v3.1.0rc1
v3.1.0rc2
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.2.0
v3.2.0rc1
v3.2.0rc2
v3.3.0
v3.3.0rc1
v3.3.0rc2
v3.3.0rc3
v3.4.0
v3.4.0rc1
v3.4.0rc2
v3.4.1
v3.5.0
v3.5.0rc1
v3.5.0rc2
v3.5.0rc3
v3.5.1
v3.5.2
v3.5.3

v4.*

v4.0.0
v4.0.0rc1
v4.0.0rc2
v4.0.0rc3
v4.0.0rc4
v4.0.1
v4.0.2
v4.1.0
v4.1.0rc1
v4.1.0rc2
v4.1.0rc3
v4.2.0
v4.2.0-beta1
v4.2.0-beta2
v4.2.0-beta3
v4.2.0-rc1
v4.2.0-rc2
v4.3.0
v4.3.0-beta.1
v4.3.0-beta.2
v4.3.0-rc.1
v4.3.1
v4.3.10
v4.3.11
v4.3.12
v4.3.13
v4.3.14
v4.3.15
v4.3.16
v4.3.2
v4.3.3
v4.3.4
v4.3.5
v4.3.6
v4.3.7
v4.3.8
v4.3.9
v4.4.0
v4.4.0-beta.1
v4.4.0-beta.2
v4.4.0-rc.1
v4.4.1
v4.4.10
v4.4.2
v4.4.3
v4.4.4
v4.4.5
v4.4.6
v4.4.7
v4.4.8
v4.4.9
v4.5.0
v4.5.0-beta.1
v4.5.0-beta.2
v4.5.0-rc.1
v4.5.0-rc.2
v4.5.0-rc.3
v4.5.1
v4.5.2
v4.5.3

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-22246.json"