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CVE-2026-117535— REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool

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.

REDAXO 5.21.3 之前的版本在后台媒体库详情页面中存在反射型跨站脚本（XSS）漏洞，原因是 参数在渲染时未进行 HTML 转义。未认证的攻击者可诱使拥有媒体权限的已登录后台用户点击精心构造的链接。注入的脚本随后可读取 CSRF 令牌，并以受害者的权限执行操作；若受害者为管理员，甚至可通过修改模板或模块实现代码执行。

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-117535

Vulnerability Information
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Vulnerability Title
REDAXO before 5.21.3 Reflected XSS via opener_link in Media Pool
Source: CVE Program / CVE List V5
Vulnerability Description
REDAXO before 5.21.3 contains a reflected cross-site scripting vulnerability in the backend media pool detail page, where the opener_link parameter is rendered without HTML escaping. Unauthenticated attackers can lure logged-in backend users with media permissions into clicking a crafted link. The injected script can then read the CSRF token and perform actions with the victim's permissions, including code execution via template or module edits when the victim is an administrator.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
redaxo core 0 ~ 5.21.3 -

II. Public POCs for CVE-2026-117535

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III. Intelligence Information for CVE-2026-117535

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Other References for CVE-2026-117535 (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-2026-117534 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-2026-117538 4.1 MEDIUM REDAXO before 5.21.0 Reflected XSS via Packages API function Parameter
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