Foxit PDF Editor Cloud XSS Vulnerabilities Patched
Foxit released security updates for Foxit PDF Editor Cloud (and related Foxit eSign components) to address two cross-site scripting (XSS) flaws that could allow arbitrary JavaScript execution in a victim’s browser when handling crafted content. The issues are tracked as CVE-2026-1591 and CVE-2026-1592 (both CWE-79) and were attributed to insufficient input validation and improper output encoding that allowed untrusted data to be embedded into the application’s HTML.
The vulnerable functionality includes the File Attachments list and Layers panel, where attackers could inject payloads via crafted attachment filenames or manipulated layer names inside PDFs, requiring user interaction (e.g., opening/interacting with malicious documents) and typically authenticated access. Both CVEs are rated moderate severity with CVSS v3.0 6.3; exploitation could expose sensitive information available to the user’s session (e.g., document contents and session data). Foxit’s guidance is to ensure affected services are updated; the most recent referenced update for PDF Editor Cloud was released February 3, 2026.
Timeline
Feb 3, 2026
Foxit patches two XSS flaws in PDF Editor Cloud
On 2026-02-03, Foxit released security updates for Foxit PDF Editor Cloud to address CVE-2026-1591 and CVE-2026-1592, two moderate-severity XSS vulnerabilities in the File Attachments list and Layers panel. The flaws could allow arbitrary JavaScript execution in a user's browser and potentially expose document contents or session data if a user interacted with crafted content.
Jan 15, 2026
Foxit eSign patch released for XSS flaw CVE-2025-66523
Foxit released a security update for Foxit eSign on 2026-01-15 to fix CVE-2025-66523, a cross-site scripting vulnerability caused by improper handling of URL parameters in crafted links. Foxit said the issue was fully patched through its standard update process.
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