Auth bypass in Fedify Hollo
CVE-2026-25808
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 outb…
Vulnerability class: Broken Access Control
EPSS: 0.004 (35.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Fedify Hollo
- Fedify-dev Hollo — versions < 0.6.20, 0.7.2, >= 7.0.0, < 0.7.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-25808?
- CVE-2026-25808 is a high-severity vulnerability in Fedify Hollo, classified under Missing Authorization. CVSS score: 7.5/10. Published 2026-02-09.
- How severe is CVE-2026-25808?
- High severity. CVSS v3 base score is 7.5 out of 10.