Vulnerability · Published Feb 9, 2026 · Assigned by GitHub_M
CVE-2026-25808Hollo DMs get leaked and can be seen on Webfinger Browser
High 7.5
In plain English
A high-severity missing authorization in hollo from fedify-dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 57.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| fedify-dev | hollo | < 0.6.20, 0.7.2>= 7.0.0, < 0.7.2 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/fedify-dev/hollo/security/advisories/GHSA-6r2w-3pcj-v4v5 x_refsource_CONFIRM
- https://github.com/fedify-dev/hollo/commit/329969c502ef092d5c3f9c2c20421c34f4ff0f0e x_refsource_MISC
- https://github.com/fedify-dev/hollo/releases/tag/0.6.20 x_refsource_MISC
- https://github.com/fedify-dev/hollo/releases/tag/0.7.2 x_refsource_MISC