JavaScript execution via unescaped AcroForm appearance state
Published Feb 19, 2026 · Updated Feb 19, 2026
PDF object injection in the AcroForm module in Parallax jsPDF before 4.2.0 allows remote attackers to execute JavaScript in generated PDFs. The AcroFormChildClass appearanceState setter writes its value directly into the /AS PDF name, so delimiters can terminate that name and inject an /AA JavaScript action. Exploitation requires a consuming application to pass unsanitized attacker input and a victim to hover over the resulting radio option; the action can read or modify data accessible to the PDF viewer.
Summary
What happened
PDF object injection in the AcroForm module in Parallax jsPDF before 4.2.0 allows remote attackers to execute JavaScript in generated PDFs. The AcroFormChildClass appearanceState setter writes its value directly into the /AS PDF name, so delimiters can terminate that name and inject an /AA JavaScript action. Exploitation requires a consuming application to pass unsanitized attacker input and a victim to hover over the resulting radio option; the action can read or modify data accessible to the PDF viewer.
The record
- CVE
- CVE-2026-25940
- Published
- Feb 19, 2026
- Updated
- Feb 19, 2026
- Vendor
- Parallax
- Product
- jsPDF
- Classifications
- CWE-116, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 19, 2026CVE publishedPublication date reported by the CVE source.
- Feb 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- AcroForm appearanceState PDF object injection proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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