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OpenAdvisories
High · 7.5 CVE-2026-25808 EUVD-2026-6393

Hollo DMs get leaked and can be seen on Webfinger Browser

Published Feb 9, 2026 · Updated Feb 10, 2026 · Assigned by GitHub_M

Description

Hollo is a federated single-user microblogging software designed to be federated through ActivityPub. Prior to 0.6.20 and 0.7.2, there is a security vulnerability where DMs and followers-only posts were exposed through the ActivityPub outbox endpoint without authorization. This vulnerability is fixed in 0.6.20 and 0.7.2.

Affected products

VendorProductAffectedFixed
fedify-dev hollo < 0.6.20, 0.7.2, >= 7.0.0, < 0.7.2 —

References