CVE-2026-105454Medium· 5.3▾ SunlitRT's automatic link creation for URLs in HTML ticket content does not HTML-escape the URL it places in the link. A URL crafted to break out of the link's address can add a script that runs when the ticket history is dis…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.4%
RT's automatic link creation for URLs in HTML ticket content does not HTML-escape the URL it places in the link. A URL crafted to break out of the link's address can add a script that runs when the ticket history is displayed, with no further action by the viewer. Anyone who can add HTML content to a ticket can plant it. That includes an unauthenticated sender of HTML email to any queue that grants CreateTicket or ReplyToTicket to Everyone, which is routine for a queue that accepts mail from the public. The script runs in the session of any user who views the ticket, and can act in RT with that user's authority.
This issue was fixed in version 5.0.11 and 6.0.4
request_tracker >= 5.0.0 < 5.0.11request_tracker >= 6.0.0 < 6.0.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Set @Active_MakeClicky to an empty list in RT_SiteConfig.pm and restart the web server. This disables automatic link creation for URLs in ticket content.
Connected by shared product, vendor, weakness, or advisory.
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