CVE-2026-31938
CriticalCVSS 9.6Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
jsPDF library prior to version 4.2.1 is vulnerable to HTML injection (including scripts) via user control of the `options` argument in the `output` function. An attacker can supply malicious values that, when the PDF is generated and opened in the victim's browser, execute in the victim's browser context.
Risk Assessment
The risk involves potential theft or modification of sensitive data from the victim's browser context, such as session cookies, authentication tokens, or other information accessible within the domain where the PDF is opened.
Recommendation
Immediately update jsPDF to version 4.2.1 or later. If updating is not possible, strictly sanitize all user input before passing it to the `output` function.
Original NVD description (English source)
jsPDF is a library to generate PDFs in JavaScript. Prior to version 4.2.1, user control of the `options` argument of the `output` function allows attackers to inject arbitrary HTML (such as scripts) into the browser context the created PDF is opened in. The vulnerability can be exploited in the following scenario: the attacker provides values for the output options, for example via a web interface. These values are then passed unsanitized (automatically or semi-automatically) to the attack victim. The victim creates and opens a PDF with the attack vector using one of the vulnerable method overloads inside their browser. The attacker can thus inject scripts that run in the victims browser context and can extract or modify secrets from this context. The vulnerability has been fixed in [email protected]. As a workaround, sanitize user input before passing it to the output method.