Stored cross-site scripting in Opti-Behavior plugin for WordPress
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Opti-Behavior plugin for WordPress from optiuser is affected in all versions up to and including 1.9.2.1. Insufficient input sanitization and output escaping of the 'targetUrl' parameter (CWE-79) let an unauthenticated attacker store scripts that run in the browser of any user who opens an injected page. The nonce that protects the ingest endpoint is publicly exposed to every anonymous visitor on tracked pages, so no account is needed.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
The Opti-Behavior – Self-Hosted Heatmaps, Session Recordings, Funnels, A/B Testing & Smart Insights plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'targetUrl' parameter in all versions up to, and including, 1.9.2.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The ingest endpoint is gated only by a nonce that is publicly emitted to every anonymous visitor on tracked pages via optiBehaviorHeatmapConfig.nonce, meaning no account or authentication of any kind is required to write the malicious payload.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| optiuser | Opti-Behavior – Self-Hosted Heatmaps, Funnels, A/B Testing & Smart Insights | up to 1.9.2.1 | — | No fix listed | CNA |
- Opti-Behavior – Self-Hosted Heatmaps, Funnels, A/B Testing & Smart Insights Vendoroptiuser Affected up to 1.9.2.1 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Opti-Behavior.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-16 Threatist record created from CVE-2026-95686
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: MEDIUM → LOW
- 2026-10-16 Alias added: GHSA-x53h-w4xx-wqx7
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/41f6939d-d87a-47e5-979f-2cad021c6e81?source=cve
- https://plugins.trac.wordpress.org/browser/opti-behavior/tags/1.9.1/assets/js/metabox-analytics.js#L553
- https://plugins.trac.wordpress.org/browser/opti-behavior/tags/1.9.1/admin/class-opti-behavior-heatmap-ajax-handler.php#L1652
- https://plugins.trac.wordpress.org/browser/opti-behavior/tags/1.9.1/admin/class-opti-behavior-heatmap-ajax-handler.php#L3455
- https://plugins.trac.wordpress.org/browser/opti-behavior/tags/1.9.1/admin/class-opti-behavior-heatmap-post-metabox.php#L1389
- https://plugins.trac.wordpress.org/browser/opti-behavior/tags/1.9.1/public/class-opti-behavior-heatmap-frontend.php#L905
- https://plugins.svn.wordpress.org/opti-behavior/
- https://plugins.trac.wordpress.org/changeset/3738510/opti-behavior/trunk/assets/js/metabox-analytics.js
More optiuser vulnerabilities
- TI-2026-75204 Stored DOM-based cross-site scripting in Opti-Behavior plugin CVSS 3.1HIGH 7.2
Sources
- CVE-2026-95686 · CVE Program
- CVE-2026-95686 · NVD
- FIRST EPSS
- GHSA-x53h-w4xx-wqx7 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences