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CVE-2026-117538— REDAXO before 5.21.0 Reflected XSS via Packages API function Parameter

Quick assessment

Affected
redaxo core
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.

在 5.21.0 之前的 REDAXO 版本中，后台包 API 存在一个反射型跨站脚本（XSS）漏洞。该漏洞源于函数参数被直接拼接到错误消息中，而该消息在渲染时未进行 HTML 转义。攻击者可诱使已认证的后台用户访问一个包含有效 CSRF 令牌的特制链接，从而执行 JavaScript 代码，实施同源操作或读取 DOM 数据。

CVSS 4.1 · Medium
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I. Basic Information for CVE-2026-117538

Vulnerability Information
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Vulnerability Title
REDAXO before 5.21.0 Reflected XSS via Packages API function Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
REDAXO before 5.21.0 contains a reflected cross-site scripting vulnerability in the backend packages API, where the function parameter is concatenated into an error message rendered without HTML escaping. Attackers can lure an authenticated backend user to a crafted link containing a valid CSRF token, executing JavaScript that performs same-origin actions or reads DOM data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
redaxo core 0 ~ 5.21.0 -

II. Public POCs for CVE-2026-117538

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III. Intelligence Information for CVE-2026-117538

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Other References for CVE-2026-117538 (2)

Same Patch Batch · redaxo · 2026-10-27 · 15 CVEs total

CVE-2026-117532 9.8 CRITICAL REDAXO Core 5.3.0 before 5.21.4 Authentication Bypass via History Plugin
CVE-2026-117536 8.8 HIGH REDAXO before 5.21.3 CSRF Token Bypass via users/users Privilege Escalation
CVE-2026-116896 7.5 HIGH REDAXO before 5.21.5 Privilege Escalation via Backup Export of Authentication Tables
CVE-2026-116898 7.1 HIGH REDAXO before 5.21.4 Missing Authorization in Media Pool Bulk Move
CVE-2026-116893 6.8 MEDIUM REDAXO core before 5.21.5 Missing Authorization in rex_api_package API
CVE-2026-116897 6.5 MEDIUM REDAXO before 5.21.4 Missing Authorization in Version and History Previews
CVE-2026-116899 6.5 MEDIUM REDAXO before 5.21.4 Broken Access Control in Slice Operations
CVE-2026-117535 6.1 MEDIUM REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool
CVE-2026-117534 5.4 MEDIUM REDAXO before 5.21.3 CSRF in Article History Plugin
CVE-2026-116900 5.4 MEDIUM REDAXO before 5.21.4 Stored XSS via Media and Link Input Widgets
CVE-2026-116895 5.4 MEDIUM REDAXO before 5.21.5 CSRF via Safe Mode Toggle Parameter
CVE-2026-117533 4.4 MEDIUM REDAXO 5.18.0 before 5.21.4 Stored XSS via Unsanitized Mediapool SVG Uploads
CVE-2026-116894 4.2 MEDIUM REDAXO before 5.21.5 Insufficient Session Expiration on Password Change
CVE-2026-117537 4.1 MEDIUM REDAXO before 5.21.0 Reflected XSS via Metainfo API type Parameter

IV. Related Vulnerabilities

Same product: core
Same vendor: redaxo
Same weakness: CWE-79