CVE-2026-25808 HIGH

CVE-2026-25808: Hollo DMs get leaked and can be seen on Webfinger Browser

Vendor Fedify-Dev
Product hollo
Weakness CWE-862 · Missing authorization
Published February 9, 2026
Last update February 10, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 9, 2026 CVE published
February 10, 2026 Record updated