CVE-2025-62176
mediumpriority · track · 0EPSS 0.003 · 19 %ileEUUSEPSS · scored 2026-10-27
Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon before 4.4.6, 4.3.14, and 4.2.27, the streaming server accepts serving events for public timelines to clients using any valid authentication token, even if those tokens lack the read:statuses scope. This allows OAuth clients without the read scope to subscribe to public channels and receive public timeline events. The impact is limited, as this only affects new public posts published on the public timelines and requires an otherwise valid token, but this may lead to unexpected access to public posts in a limited-federation setting. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- BIT-mastodon-2025-62176Mastadon streaming server allows OAuth clients without the `read` scope to subscribe to public channels2025-10-15vendor · osvUS
Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon before 4.4.6, 4.3.14, and 4.2.27, the streaming server accepts serving events for public timelines to clients using any valid authentication token, even if those tokens lack the read:statuses scope. This allows OAuth clients without the read scope to subscribe to public channels and receive public timeline events. The impact is limited, as this only affects new public posts published on the public timelines and requires an otherwise valid token, but this may lead to unexpected access to public posts in a limited-federation setting. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.
also known as (3)
Other names and identifiers for this entity.
sources
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references (8)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-62176cnnvd
- https://github.com/mastodon/mastodon/commit/7e98fa9b476fdaed235519f1d527eb956004ba0ccnnvd
- https://github.com/mastodon/mastodon/releasesPatchcnnvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-7gwh-mw97-qjgpcnnvd
- https://github.com/mastodon/mastodon/commit/7e98fa9b476fdaed235519f1d527eb956004ba0cenisa_euvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-7gwh-mw97-qjgpenisa_euvd
- https://github.com/mastodon/mastodon/commit/7e98fa9b476fdaed235519f1d527eb956004ba0cPatchnvd
- https://github.com/mastodon/mastodon/security/advisories/GHSA-7gwh-mw97-qjgpVendor Advisorynvd
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