CVE-2025-53941 Hollo renders posts received with form elements and allows submission
Hollo allows HTML form injection in posts, enabling attackers to execute scripts or hijack user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-53941?
CVE-2025-53941 is a medium-severity cross-site scripting vulnerability in fedify-dev hollo, published on 17 Jul 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2025-53941?
How do I fix CVE-2025-53941?
No fix has been published for CVE-2025-53941 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-53941 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-53941 exists.
Sources
Also known as GHSA-w7gc-g3x7-hq8h.