# CVE-2026-72915 — mastodon

> As of 2026-08-11, CVE-2026-72915 is a HIGH-severity vulnerability in mastodon, CVSS v3.1 7.5, EPSS 0.2% (19.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-72915 as of 2026-08-11; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-11

## What is CVE-2026-72915?

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.

The record classifies CVE-2026-72915 under weakness class [CWE-200](https://intel.threadlinqs.com/cwe/CWE-200). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 56 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 19.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-10, last modified 2026-08-11

## Is CVE-2026-72915 being exploited?

It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **mastodon**: mastodon

## How to fix CVE-2026-72915

No vendor patch reference has been recorded for CVE-2026-72915 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-72915

No threat campaign in the Threadlinqs corpus currently references CVE-2026-72915, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-12. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/mastodon/mastodon/security/advisories/GHSA-hx34-2pfw-2qfj)

**Other references**

- [github.com](https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074)
- [github.com (930aa9fee26bf9eaefe27826fa1061288d83373b)](https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b)
- [github.com (v4.6)](https://github.com/mastodon/mastodon/releases/tag/v4.6.4)
- [github.com (v4.7.0 beta)](https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-72915
Full detection coverage and IOCs for threats exploiting CVE-2026-72915 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp