Design/Logic Flaw

2023-02-2219:15:00

PRIOn knowledge base

www.prio-n.com

misskey

remote attack

javascript code

version 13.5.0

upgrade

link validation

activitypub

decentralized social media

untrusted instances

0.001 Low

EPSS

Percentile

27.1%

JSON

Misskey is an open source, decentralized social media platform. In versions prior to 13.5.0 the link to the instance to the sender that appears when viewing a user or note received through ActivityPub is not properly validated, so by inserting a URL with a javascript scheme an attacker may execute JavaScript code in the context of the recipient. This issue has been fixed in version 13.5.0. Users are advised to upgrade. Users unable to upgrade should not “view on remote” for untrusted instances.