Medium severity · published Oct 18, 2026
CVE-2026-109937
Otter Blocks < 3.2.3 - Unauthenticated Open Redirect via Stripe Checkout Block
5.4
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OB
Otter Blocks ·
before 3.2.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-109937
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-109937
wpscan.com
https://wpscan.com/vulnerability/9765313d-c879-457f-851f-dab74b8d90a0/
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