CVE-2026-86834 MetForm 2.2.1 - 4.3.0 - Unauthenticated Debug File Disclosure via HubSpot Forms Integration
Unauthenticated attackers can read sensitive debug files containing API data and cookies if the HubSpot Forms integration is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86834?
CVE-2026-86834 is a low-severity vulnerability in Unknown MetForm, published on 3 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The MetForm WordPress plugin before 4.3.1 does not properly restrict access to a debug file it writes to the web root on every form submission when its HubSpot Forms integration is enabled, allowing unauthenticated attackers to read upstream API response data, including correlation identifiers and cookies.
Weakness: CWE-200
Which versions are affected by CVE-2026-86834?
How do I fix CVE-2026-86834?
No fix has been published for CVE-2026-86834 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-86834 being exploited?
There is no known exploitation of CVE-2026-86834 in the wild and no public exploit code.
Sources
Also known as GHSA-cr6m-q4jq-r64m.