CVE-2026-85485Network attack vector

Cross-site scripting via unescaped rendered errors

Published Sep 8, 2026 · Updated Sep 8, 2026

Cross-site scripting in HTML::FormHandler before 0.410002 allows remote attackers to execute JavaScript through crafted form errors. The Table layout and Bootstrap 2 and 3 wrappers splice each error string directly into HTML instead of entity-encoding it. An application must use one of those renderers and produce an attacker-influenced error, and a victim must view the resulting page for script to run in that application's origin.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in HTML::FormHandler before 0.410002 allows remote attackers to execute JavaScript through crafted form errors. The Table layout and Bootstrap 2 and 3 wrappers splice each error string directly into HTML instead of entity-encoding it. An application must use one of those renderers and produce an attacker-influenced error, and a victim must view the resulting page for script to run in that application's origin.

The record

CVE
CVE-2026-85485
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
FormHandler Contributors
Product
HTML-FormHandler
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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.

  1. Affected versionversion=0 <0.410002

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FormHandler Contributors · HTML-FormHandlerversion=0 <0.410002

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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