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Fencer Vulns
critical 9.6

CVE-2026-31938 json

jsPDF has HTML Injection in New Window paths

published 2026-03-17 7 mo ago modified 2026-09-10 1 mo ago also GHSA-wfv2-pwc8-crg5 , EUVD-2026-12755

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits
0
none known

Summary

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 jspdf@4.2.1. As a workaround, sanitize user input before passing it to the output method.

Patch / fix

  • npm jspdf 4.2.1
  • Red Hat Red Hat Advanced Cluster Security 4.8 1775594119
  • Red Hat Red Hat Advanced Cluster Security 4.9 1775594284

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-31938 updated cvss 8.1

jspdf: jsPDF: Cross site scripting via unsanitized output options

  • Red Hat Advanced Cluster Security 4.8 advanced-cluster-security 1775594119
    fixed: vendor fix RHSA-2026:7110
  • Red Hat Advanced Cluster Security 4.9 advanced-cluster-security 1775594284
    fixed: vendor fix RHSA-2026:7128
  • Red Hat Advanced Cluster Security 4.8 advanced-cluster-security 1774163438, advanced-cluster-security 1774294180, advanced-cluster-security 1775594119 Red Hat Advanced Cluster Security 4.9 advanced-cluster-security 1774260292, advanced-cluster-security 1774294136, advanced-cluster-security 1775594284
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
7 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
GitHub 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
npm jspdf
<4.2.1
4.2.1

Affected products

  • parallax jsPDF
  • Red Hat Red Hat Advanced Cluster Security 4.8
  • Red Hat Red Hat Advanced Cluster Security 4.9

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.