CVE-2026-105454
Published:October 30, 2026
Updated:November 04, 2026
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
Affected Packages
https://github.com/bestpractical/rt.git (GITHUB):
Affected version(s) >=rt-6.0.0beta1 <rt-6.0.4Fix Suggestion:
Update to version rt-6.0.4https://github.com/bestpractical/rt.git (GITHUB):
Affected version(s) >=rt-4.2.14rc1 <rt-5.0.11 || >=rt-4.4.2rc1 <rt-5.0.11 || >=rt-5.0.0alpha1 <rt-5.0.11Fix Suggestion:
Update to version rt-5.0.11Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation
EPSS
Base Score:
0.44