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Vulnerability record · CVE-2026-25808 · published 9 February 2026

CVE-2026-25808: Fedify hollo missing authorization vulnerability

Fedify · Hollo

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.

7.5 CVSS 3.1 High EPSS 0.52% · top 58.4% CWE-862 · Missing authorization
7.5CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/fedify-dev/hollo/commit/329969c502ef092d5c3f9c2c20421c34f4ff0f0e Patch
https://github.com/fedify-dev/hollo/releases/tag/0.6.20 ProductRelease Notes
https://github.com/fedify-dev/hollo/releases/tag/0.7.2 ProductRelease Notes
https://github.com/fedify-dev/hollo/security/advisories/GHSA-6r2w-3pcj-v4v5 ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-25808), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.