Otter Blocks: Open redirect through Stripe Checkout return URLs
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. The export supplies no additional endpoint, action, parameter or function details beyond those described above.
- Component
- Otter Blocks
- Plugin slug
otter-blocks- Affected
- < 3.2.3
- Safe version
3.2.3- Published
- Oct 18, 2026
This CVE was published Oct 18, 2026 and is one of 20 known issues for this plugin.
Update, patch or deactivate.
Update Otter Blocks to 3.2.3 or a later supported release. The completed authoritative export identifies this fixed boundary. Validate return URLs against approved same-site destinations before creating the Stripe Checkout session.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N