Cross-site scripting in webpushr Web Push Notifications – Webpushr
Key facts
- Attack vector
- Network
- Privileges required
- Low
- 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 Webpushr Push Notifications plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'webpushr_notification_title' and 'webpushr_notification_body' parameters in versions up to, and including, 4.39.0. This is due to insufficient input sanitization in the save_send_notification_flag() function and missing output escaping in the wpp_notification_box() function, which concatenates raw post meta values directly into HTML attribute and textarea contexts. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9729
- 2026-10-03 Alias added: GHSA-9vh2-928p-mm63
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/39286096-2efa-450b-b491-b3d40de5a4ae?source=cve
- https://plugins.trac.wordpress.org/browser/webpushr-web-push-notifications/trunk/include/webpushr_functions.php#L513
- https://plugins.trac.wordpress.org/browser/webpushr-web-push-notifications/trunk/include/webpushr_functions.php#L517
- https://plugins.trac.wordpress.org/browser/webpushr-web-push-notifications/trunk/include/webpushr_functions.php#L699
- https://plugins.trac.wordpress.org/browser/webpushr-web-push-notifications/trunk/include/webpushr_functions.php#L702
More webpushr vulnerabilities
- TI-2023-17517 WordPress Webpushr Plugin <= 4.34.0 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2026-19776 WordPress Webpushr plugin <= 4.38.0 - Sensitive Data Exposure vulnerability CVSS 3.1MEDIUM 5.3
- TI-2023-05172 Webpushr < 4.35.0 - Unauthenticated Stored XSS CVSS 3.1MEDIUM 5.4
Sources
- CVE-2026-9729 · CVE Program
- CVE-2026-9729 · NVD
- FIRST EPSS
- GHSA-9vh2-928p-mm63 · 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