CVE-2026-48212 OTRS GmbH (former OTRS AG) CVE debrief

Who should care

OTRS administrators, users accessing custom pages, and security teams responsible for monitoring and updating OTRS installations should be aware of this vulnerability and assess their exposure.

Why it matters

This stored XSS vulnerability in OTRS Custom Pages allows administrators to enter arbitrary JavaScript, which is executed in users' browsers. OTRS administrators, users accessing custom pages, and security teams should verify their exposure and assess the need for updates to prevent potential phishing or malicious actions.

• Execution of arbitrary JavaScript in users' browsers
• Potential for phishing or malicious actions through custom page content
• Need for verification of OTRS version and exposure
• Priority for updating to 2026.7.X or later

Technical summary

The CVE record describes a stored XSS vulnerability in OTRS Custom Pages, allowing administrators to enter arbitrary JavaScript that is executed in users' browsers. This issue affects multiple OTRS versions, including 7.0.X, 8.0.X, 2023.X, 2024.X, 2025.X, and 2026.X before 2026.7.X. The vulnerability enables the execution of arbitrary JavaScript in users' browsers, potentially leading to phishing or malicious actions through custom page content. OTRS administrators and users accessing custom pages should verify their exposure and assess the need for updates to prevent potential security risks.

Defensive priority

OTRS administrators and users accessing custom pages should verify their exposure and assess the need for updates.

Recommended defensive actions

• Verify OTRS version and check for updates to 2026.7.X or later
• Restrict administrator access to custom page content
• Monitor custom page usage and user access
• Implement additional security measures for user input validation
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record indicates that an OTRS administrator can enter arbitrary JavaScript into the content of an OTRS Custom Page, which is stored and executed in the browser of users accessing that page. Affected versions include 7.0.X, 8.0.X, 2023.X, 2024.X, 2025.X, and 2026.X before 2026.7.X.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.