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CVE-2026-31938

Parall Jspdf cross-site scripting (XSS)

9.6 CRITICALEPSS 0.40%
  1. Published18 Mar 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Affected products

Parall Jspdf< 4.2.1

Remediation

Fixed in
Parall Jspdf≥ 4.2.1

References

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Frequently asked

Is CVE-2026-31938 being actively exploited?

CVE-2026-31938 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-31938?

CVE-2026-31938 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-31938?

Affected products include Parall Jspdf.

How do I fix CVE-2026-31938?

Upgrade affected software to a fixed version, for example Parall Jspdf 4.2.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-31938 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.