Medium [CVE-2026-9318] Arbitrary JavaScript execution via stored Cross-Site Scripting in HTML export
This medium-severity Red Hat Linux advisory covers CVE-2026-9318 affecting Red Hat Ansible Automation Platform 2, Red Hat Satellite 6, Red Hat Update Infrastructure 4 for Cloud Providers.
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Summary
tablib prior to 3.10.0 contains a stored cross-site scripting vulnerability in the HTML export functionality that allows attackers to execute arbitrary JavaScript by embedding malicious payloads in dataset titles, which are interpolated unsanitized into HTML output via the export_book method in the _html.py format handler.
Attackers can rename worksheet sheets in imported files such as XLSX, ODS, XLS, or YAML with script payloads that are assigned to the Dataset title attribute and rendered unescaped inside an HTML h3 tag, leading to session hijacking, unauthorized administrative actions, and sensitive data exposure when the output is rendered in a browser.
A flaw was found in tablib. By embedding malicious payloads within dataset titles, which are not properly sanitized during HTML export, an attacker can trigger the execution of these scripts when the exported HTML is viewed in a browser.
Exploitation requires an attacker to embed malicious JavaScript in dataset titles within imported files, which then executes when a user renders the exported HTML in a browser. Red Hat products that process untrusted data and utilize tablib for HTML export are affected, as this could lead to session hijacking or unauthorized actions.
Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N). Weakness: CWE-79.
- < 3.10.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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