Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fedify | Hollo | >= 0.6.0, < 0.6.20 |
Related Weaknesses (CWE)
References
- https://github.com/fedify-dev/hollo/commit/329969c502ef092d5c3f9c2c20421c34f4ff0Patch
- https://github.com/fedify-dev/hollo/releases/tag/0.6.20ProductRelease Notes
- https://github.com/fedify-dev/hollo/releases/tag/0.7.2ProductRelease Notes
- https://github.com/fedify-dev/hollo/security/advisories/GHSA-6r2w-3pcj-v4v5Vendor AdvisoryExploit
FAQ
What is CVE-2026-25808?
CVE-2026-25808 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 we...
How severe is CVE-2026-25808?
CVE-2026-25808 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25808?
Check the references section above for vendor advisories and patch information. Affected products include: Fedify Hollo.