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CVE-2026-9729— Web Push Notifications <= 4.39.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'webpushr_notification_title' Post Meta Parameter

Quick assessment

Affected
webpushr Web Push Notifications – Webpushr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

webpushr Web Push Notifications – Webpushr是webpushr公司的一款网站推送通知的浏览器插件。 webpushr Web Push Notifications – Webpushr 4.39.0及之前版本存在跨站脚本漏洞，该漏洞源于save_send_notification_flag()函数输入清理不足及wpp_notification_box()函数缺少输出转义，将原始post元值直接拼接至HTML属性和textarea环境，可能导致具有contributo

CVSS 6.4 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
webpushr Web Push Notifications – Webpushr ≤ 4.39.0 affected
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I. Basic Information for CVE-2026-9729

Vulnerability Information
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Vulnerability Title
Web Push Notifications <= 4.39.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'webpushr_notification_title' Post Meta Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
webpushr Web Push Notifications – Webpushr 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
webpushr Web Push Notifications – Webpushr是webpushr公司的一款网站推送通知的浏览器插件。 webpushr Web Push Notifications – Webpushr 4.39.0及之前版本存在跨站脚本漏洞，该漏洞源于save_send_notification_flag()函数输入清理不足及wpp_notification_box()函数缺少输出转义，将原始post元值直接拼接至HTML属性和textarea环境，可能导致具有contributo
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
webpushr Web Push Notifications – Webpushr 0 ~ 4.39.0 -

II. Public POCs for CVE-2026-9729

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III. Intelligence Information for CVE-2026-9729

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Patches & Fixes for CVE-2026-9729 (2)

Vendor Advisories for CVE-2026-9729 (1)

Other References for CVE-2026-9729 (1)

IV. Related Vulnerabilities

Same product: Web Push Notifications – Webpushr
Same vendor: webpushr
Same weakness: CWE-79

V. Comments for CVE-2026-9729

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