CVE-2025-22888 Cross-site scripting in Movable Type (8.0.x series)
Stored XSS in Movable Type allows arbitrary script execution in logged-in users' browsers via the custom block editor.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-22888?
CVE-2025-22888 is a medium-severity cross-site scripting vulnerability in Six Apart Ltd. Movable Type (8.0.x series), published on 19 Feb 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Movable Type contains a stored cross-site scripting vulnerability in the custom block edit page of MT Block Editor. If exploited, an arbitrary script may be executed on a logged-in user's web browser.
Weakness: CWE-79
Which versions are affected by CVE-2025-22888?
How do I fix CVE-2025-22888?
No fix has been published for CVE-2025-22888 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-2025-22888 being exploited?
There is no known exploitation of CVE-2025-22888 in the wild and no public exploit code.
Sources
Also known as GHSA-f84q-9f7w-hp3p.