Vulnerability · Published Jul 17, 2025 · Assigned by GitHub_M
CVE-2025-53941Hollo renders posts received with form elements and allows submission
Medium 6.1
In plain English
A medium-severity cross-site scripting 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 0.3% (higher than 19% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.3%top 80.7% 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. Versions prior to 0.6.5 allow HTML form elements to be submitted, making the software vulnerable to HTML injection. Version 0.6.5 fixes the issue.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| fedify-dev | hollo | < 0.6.5 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/fedify-dev/hollo/security/advisories/GHSA-w7gc-g3x7-hq8h x_refsource_CONFIRM
- https://github.com/fedify-dev/hollo/commit/f9d25e10ba5406c27f9e87dfb01f75b6a52f2410 x_refsource_MISC
- https://github.com/fedify-dev/hollo/releases/tag/0.6.5 x_refsource_MISC