PT-2026-7177 · Hollo · Hollo

Aliceif · Published 2026-02-09 · Updated 2026-02-28 · CVE-2026-25808

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Hollo versions prior to 0.6.20 Hollo versions prior to 0.7.2

Description Hollo is a federated single-user microblogging software that utilizes ActivityPub for federation. A security issue exists where direct messages (DMs) and posts restricted to followers were exposed through the ActivityPub outbox endpoint without proper authorization. This allowed unauthorized access to sensitive information. The issue affects the ActivityPub outbox endpoint.

Recommendations Update to Hollo version 0.6.20 or later. Update to Hollo version 0.7.2 or later.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-25808

GHSA-6R2W-3PCJ-V4V5

Affected Products

Hollo

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25808.json · Exploit
• 🔥 https://github.com/fedify-dev/hollo/security/advisories/GHSA-6r2w-3pcj-v4v5 · Exploit
• https://github.com/fedify-dev/hollo/commit/329969c502ef092d5c3f9c2c20421c34f4ff0f0e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-25808 · Security Note
• https://osv.dev/vulnerability/CVE-2026-25808 · Vendor Advisory
• https://github.com/fedify-dev/hollo/releases/tag/0.6.20 · Note
• https://github.com/fedify-dev/hollo/releases/tag/0.7.2 · Note
• https://twitter.com/VulmonFeeds/status/2021137486328496239 · Twitter Post
• https://t.me/cveNotify/153608 · Telegram Post