CVE-2026-71249Network attack vector

Unauthenticated reflected XSS via unescaped contact fields

Published Aug 5, 2026 · Updated Aug 5, 2026

Reflected XSS in 299Ko 0 allows remote attackers to execute script in a visitor's browser through crafted public contact-form fields. ContactController.php passes raw name, firstname, email, and message POST values to templates, while Template.php's _show_var() emits them without HTML escaping into an attribute and textarea. The public endpoint requires no authentication, but a visitor must submit or be induced to submit the form before the injected script runs in that visitor's browser, exposing that session to script-level actions.

CVSS severity6.1
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in 299Ko 0 allows remote attackers to execute script in a visitor's browser through crafted public contact-form fields. ContactController.php passes raw name, firstname, email, and message POST values to templates, while Template.php's _show_var() emits them without HTML escaping into an attribute and textarea. The public endpoint requires no authentication, but a visitor must submit or be induced to submit the form before the injected script runs in that visitor's browser, exposing that session to script-level actions.

The record

CVE
CVE-2026-71249
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
299Ko
Product
299Ko
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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  1. Affected versionversion=0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

299Ko · 299Koversion=0

Published CVSS scores

6.1TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

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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')
T1189Drive-by Compromise

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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