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TI-2026-76026 Aliases CVE-2026-109937GHSA-m5fx-f9px-4463

Open redirect in Otter Blocks via Stripe Checkout return URL

Priority LOW 23CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-601.

Summary

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. An unauthenticated attacker can redirect victims who complete or cancel checkout to an arbitrary external URL, which requires user interaction. A public exploit link is listed in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00146 3rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Otter Blocks (Unknown): 3.2.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownOtter Blocksbefore 3.2.33.2.3Patch availableCNA
  • Otter Blocks VendorUnknown Affected before 3.2.3 Fixed in 3.2.3 Patch available CNA

Remediation

Update Otter Blocks to version 3.2.3 or later, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Otter Blocks (Unknown) Fixed in 3.2.3

Timeline

  1. 2026-10-18 Threatist record created from CVE-2026-109937
  2. 2026-10-18 Alias added: GHSA-m5fx-f9px-4463

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences