TI-2026-83166 Aliases CVE-2026-105456 GHSA-pg4w-4q6c-jvpm

Stored XSS via HTML scrubber rule in RTIR

LOW 24CWE-79Published 2026-10-30 · Updated 2026-10-30

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

RT for Incident Response (RTIR) from Best Practical Solutions, from 5.0.0 before 5.0.11 and from 6.0.0 before 6.0.4, extends RT's HTML scrubber so that any link containing an internal placeholder is kept, even when it uses the javascript: scheme. The change applies to the whole RT instance once RTIR is installed, so stored cross-site scripting (CWE-79) can be planted in any ticket. An unauthenticated sender of HTML email to the Incident Reports queue can store such a link, and the script runs in the session of a user who clicks it, acting with that user's authority in RT.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0045 39th percentileScored 2026-11-07

Fix Fixed RT for Incident Response (Best Practical Solutions): 5.0.11, 6.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Best Practical Solutions	RT for Incident Response	5.0.0 to before 5.0.11; 6.0.0 to before 6.0.4	5.0.11, 6.0.4	Patch available	CNA

RT for Incident Response VendorBest Practical Solutions Affected 5.0.0 to before 5.0.11; 6.0.0 to before 6.0.4 Fixed in 5.0.11, 6.0.4 Patch available CNA

Remediation

Upgrade RT for Incident Response to 5.0.11 or 6.0.4. The sources list no fixed version for any other product line.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Fix · CNA RT for Incident Response (Best Practical Solutions) Fixed in 5.0.11, 6.0.4

Timeline

2026-10-30 Threatist record created from CVE-2026-105456
2026-10-30 CISA SSVC decision points changed
2026-10-30 Alias added: GHSA-pg4w-4q6c-jvpm

References

Advisory 1

https://cert.pl/en/posts/2026/10/CVE-2026-105454

Other 1

https://requesttracker.com/rtir/

TI-2003-00254 Cross-site scripting (XSS) vulnerability in the web interface for Request Tracker (RT)… CVSS 2.0MEDIUM 6.8
TI-2024-03059 Information exposure vulnerability in Request Tracker (RT) CVSS 3.1MEDIUM 5.5
TI-2006-02113 RT: Request Tracker 3.5.HEAD allows remote attackers to obtain sensitive information via… CVSS 2.0MEDIUM 5.0
TI-2026-83165 Cross-site scripting in RTIR ticket split and incident creation forms CVSS 4.0MEDIUM 5.3
TI-2026-83164 Stored XSS via crafted URLs in HTML ticket content in Request Tracker CVSS 4.0MEDIUM 5.3
TI-2012-02390 Multiple cross-site scripting (XSS) vulnerabilities in the topic administration page in… CVSS 2.0MEDIUM 4.3

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences