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CVE-2026-105456— Stored XSS via HTML scrubber rule in RTIR

Quick assessment

Affected
Best Practical Solutions RT for Incident Response
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.

RTIR 扩展了 RT 的 HTML 内容清洗器，以允许使用内部链接占位符；但该扩展会放行任何仅包含该占位符的链接，其中包括使用可执行 方案的链接。此变更在 RTIR 安装后会影响整个 RT 实例，而不仅限于 RTIR 自身的队列。任何能够向此类实例中的工单添加 HTML 内容的用户，均可存储此类恶意链接。这包括未认证的 HTML 邮件发送者，因为 RTIR 默认向所有人开放“事件报告（Incident Reports）”队列。当用户点击该链接时，脚本将在该用户的会话中执行，并能够以该用户的权限在 RT 系统中进行

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-105456

Vulnerability Information
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Vulnerability Title
Stored XSS via HTML scrubber rule in RTIR
Source: CVE Program / CVE List V5
Vulnerability Description
RTIR extends RT's HTML scrubber to allow an internal link placeholder, and the extension lets through any link that merely contains the placeholder, including links using the executable javascript: scheme. The change applies to the whole RT instance once RTIR is installed, not only to RTIR's own queues. Anyone who can add HTML content to a ticket on such an instance can store such a link. That includes an unauthenticated sender of HTML email to the Incident Reports queue, which RTIR opens to everyone by default. Script runs when a user clicks the link, in that user's session, and can act in RT with that user's authority. This issue was fixed in version 5.0.11 and 6.0.4
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
Best Practical Solutions RT for Incident Response 5.0.0 ~ 5.0.11 -

II. Public POCs for CVE-2026-105456

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III. Intelligence Information for CVE-2026-105456

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Other References for CVE-2026-105456 (2)

Same Patch Batch · Best Practical Solutions · 2026-10-30 · 3 CVEs total

CVE-2026-105455 5.3 MEDIUM Stored XSS via related ticket subject on RTIR Split and Create Incident forms
CVE-2026-105454 5.3 MEDIUM Stored XSS via crafted URLs in HTML ticket content in Request Tracker

IV. Related Vulnerabilities

Same product: RT for Incident Response
Same vendor: Best Practical Solutions
Same weakness: CWE-79