CVE-2026-3995Network attack vector

Administrator-level stored XSS via unescaped API key

Published Apr 16, 2026 · Updated Apr 16, 2026

Stored XSS in OPEN-BRAIN 0.5.0 and earlier allows remote authenticated users with administrator access to execute scripts via its API key. The plugin stores a sanitize_text_field-filtered value and prints it inside an HTML value attribute without esc_attr, allowing quote-based attribute breakout. Administrator access is required to save the payload, which executes when a user opens the affected settings page.

CVSS severity4.4
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OPEN-BRAIN 0.5.0 and earlier allows remote authenticated users with administrator access to execute scripts via its API key. The plugin stores a sanitize_text_field-filtered value and prints it inside an HTML value attribute without esc_attr, allowing quote-based attribute breakout. Administrator access is required to save the payload, which executes when a user opens the affected settings page.

The record

CVE
CVE-2026-3995
Published
Apr 16, 2026
Updated
Apr 16, 2026
Vendor
Farid Saniee Pour
Product
OPEN-BRAIN Gateway for WooCommerce
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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 <=0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Farid Saniee Pour · OPEN-BRAIN Gateway for WooCommerceversion=0 <=0.5.0

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/UI:N/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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