CVE-2026-72915 json
Mastodon: Personally-identifying information disclosure due to incorrect access control validation
published 2026-08-10 2 mo ago modified 2026-09-09 1 mo ago also BIT-mastodon-2026-72915 , EUVD-2026-55838 , GHSA-hx34-2pfw-2qfj
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mastodon 4.6.4
- joinmastodon mastodon 4.6.4
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mastodon | >=4.6.0, <4.6.4 |
4.6.4 |
Affected products
- mastodon mastodon
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
-
github.com
/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074
web
-
github.com
/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b
web
-
github.com
/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfj
web
-
github.com
/mastodon/mastodon/releases/tag/v4.6.4
web
-
github.com
/mastodon/mastodon/releases/tag/v4.7.0-beta.1
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-72915
web
Sources
- CVE List CVE-2026-72915
- NVD CVE-2026-72915
- OSV BIT-mastodon-2026-72915
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.