CVE-2026-109937 Otter Blocks < 3.2.3 - Unauthenticated Open Redirect via Stripe Checkout Block
Unauthenticated attackers can redirect users to arbitrary external URLs via the Stripe Checkout block in Otter Blocks.
- 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-2026-109937?
CVE-2026-109937 is a medium-severity vulnerability in Unknown Otter Blocks, published on 18 Oct 2026. 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
The Otter Blocks WordPress plugin before 3.2.3 does not validate that a user-supplied return URL belongs to the site before using it to build the return destination of a Stripe Checkout session, allowing unauthenticated attackers to redirect victims who complete or cancel checkout to an arbitrary external URL.
Weakness: CWE-601
Which versions are affected by CVE-2026-109937?
How do I fix CVE-2026-109937?
No fix has been published for CVE-2026-109937 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-109937 being exploited?
There is no known exploitation of CVE-2026-109937 in the wild and no public exploit code.
Sources
Also known as GHSA-m5fx-f9px-4463.