CVE-2026-42728Network attack vector

Stored XSS via deficient form-field sanitization

Published May 27, 2026 · Updated May 27, 2026

Stored cross-site scripting in HasThemes HT Contact Form 2.8.2 and earlier allows remote attackers to inject scripts through form input. The 2.8.3 changelog identifies deficient sanitization in rich-text and file-upload fields, but public records do not identify the exact storage and rendering sink. No account is required, but a privileged user must interact with the stored content; script execution is limited to the victim's browser context.

CVSS severity7.1
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in HasThemes HT Contact Form 2.8.2 and earlier allows remote attackers to inject scripts through form input. The 2.8.3 changelog identifies deficient sanitization in rich-text and file-upload fields, but public records do not identify the exact storage and rendering sink. No account is required, but a privileged user must interact with the stored content; script execution is limited to the victim's browser context.

The record

CVE
CVE-2026-42728
Published
May 27, 2026
Updated
May 27, 2026
Vendor
HasThemes
Product
HT Contact Form
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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 <=2.8.2 changes=[{"at":"2.8.3","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HasThemes · HT Contact Formversion=0 <=2.8.2 changes=[{"at":"2.8.3","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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