PDF Ecosystem Vulnerabilities Enable One-Click Attacks and PDF Object Injection
Security researchers reported multiple previously unknown weaknesses across the PDF ecosystem that can be exploited through crafted documents. Novee Security’s research into Foxit and Apryse PDF platforms described 13 vulnerability categories and 16 exploit paths, including critical XSS and OS command injection, with “one-click” scenarios where simply opening a document could trigger compromise and potentially enable account takeover or backend command execution.
Separately, a high-severity flaw in the widely used jsPDF library was disclosed as CVE-2026-25755 (CVSS 8.8), enabling PDF object injection via improper sanitization in the addJS method. By breaking out of the /JS (...) string (e.g., injecting ) >> /Action ...), an attacker can inject arbitrary PDF structures and actions such as /OpenAction, potentially triggering behavior even when JavaScript is disabled in the viewer and enabling document manipulation (e.g., altering /Annots or /Signatures) across different PDF viewers, including lightweight mobile/embedded parsers.
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How this story unfolded
3 events from the most recent confirmed update back to the earliest known activity.
jsPDF 4.1.0 recommended to mitigate CVE-2026-25755
By 2026-02-23, guidance accompanying disclosure of CVE-2026-25755 recommended upgrading to jsPDF 4.1.0 or later and avoiding addJS with untrusted input until patched. Additional mitigation advice included strict input validation to prevent malicious PDF object injection.
Researcher ZeroXJacks reports jsPDF object injection flaw
Researcher ZeroXJacks disclosed a high-severity jsPDF vulnerability, tracked as CVE-2026-25755, affecting the addJS method and enabling PDF Object Injection through improper sanitization of user-controlled input. The researcher also demonstrated a proof of concept showing how crafted payloads could inject PDF structures and trigger actions such as /OpenAction.
Novee Security releases PDF platform vulnerability study
On 2026-02-18, Novee Security published a study on Foxit and Apryse PDF systems identifying 13 vulnerability categories and 16 exploitation paths, including one-click attack scenarios, account takeover, and backend command execution risks. The researchers said they had coordinated disclosure with Foxit and Apryse and that CVEs were assigned to support patching.
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16 Vulnerabilities in Apryse WebViewer and Foxit PDF Cloud Services Enable Account Takeover and Data Theft
Researchers at **Novee** reported **16 vulnerabilities** affecting widely deployed PDF platforms **Apryse WebViewer** (formerly PDFTron) and **Foxit PDF cloud services/SDK components**, warning they could be exploited for **account hijacking, data theft, and in some cases remote code execution**. Reported issue classes include **DOM-based, stored, and reflected XSS**, **server-side request forgery (SSRF)**, **path traversal**, and **OS command injection**; testing indicated attackers could trigger exploitation via **crafted documents, messages, or URLs**, with elevated risk when these viewers are embedded inside **authenticated enterprise applications** and trusted domains. Technical details highlighted that Apryse WebViewer spans multiple trust boundaries (a React-based iframe UI ingesting untrusted inputs such as query strings and `postMessage`, a JavaScript/WebAssembly document engine, and server-side SDK services), and that insufficient validation across these boundaries enabled exploitation paths. The most severe issue described was a **critical OS command injection (CVSS 9.8)** in Foxit’s Node.js signature server component, where a POST body parameter was reportedly concatenated into a command execution path. Both **Apryse** and **Foxit** stated the findings were **responsibly disclosed** and addressed via **patches, updates, and configuration changes**, with additional security hardening performed during remediation.
Mar 21, 2026
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**.
Mar 21, 2026
Multiple Vulnerabilities Disclosed in Foxit PDF Reader and Editor
German authorities published advisories for **multiple vulnerabilities** affecting **Foxit PDF Reader** and **Foxit PDF Editor**, indicating ongoing security issues across the vendor's desktop PDF products. The notices identify separate advisory entries, `2026-0914` and `2026-1256`, covering flaws in both **Reader** and **Editor** and signaling that organizations using Foxit software should review the affected versions and available vendor guidance. The repeated disclosures suggest a broader patch-management concern for enterprises that rely on Foxit for document handling, particularly because PDF applications are common targets for malicious document-based exploitation. Security teams should prioritize validating installed Foxit versions, applying relevant updates, and monitoring for suspicious PDF-related activity on endpoints where Foxit Reader or Editor is deployed.
Apr 27, 2026