PT-2026-52082 · Mastodon · Mastodon

Publicado 2026-06-24 · Atualizado 2026-06-24 · CVE-2026-50128

NVD

CVSS v3.1

5.3

Média

Vetor base

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Mastodon is a free, open-source social network server based on ActivityPub. From 4.3.0 until 4.5.11 and 4.4.18, Mastodon has a feature to let websites credit authors of their articles. To prevent false attribution claims, Mastodon uses the attributionDomains JSON-LD term, however, an error in how it is defined makes Linked Data Signatures on the toot:attributionDomains property ineffective. An attacker can arbitrarily modify the attributionDomains value of a legitimately signed Update activity and bypass Mastodon’s signature verification. This vulnerability is fixed in 4.5.11 and 4.4.18.

Correção

Enumeração de Fraquezas

CWE-354

Identificadores relacionados

CVE-2026-50128

Produtos afetados

Mastodon

Referências · 2

• https://github.com/mastodon/mastodon/security/advisories/GHSA-rwcw-vq68-g34p · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-50128 · Nota de Segurança