CVE-2020-36731Known exploitationPublic exploitNetwork attack vector

Stored XSS via unauthenticated settings updates

Published Jun 7, 2023 · Updated Apr 8, 2026

Stored XSS in WP Desk Flexible Checkout Fields for WooCommerce 2.3.1 and earlier allows remote attackers to store scripts via settings arrays. The updateSettingsAction() function in classes/settings.php runs on admin_init without a capability check and writes unsanitized POST arrays into plugin options that render as JavaScript. No account is required to change the settings, but a logged-in administrator must open an affected dashboard view to execute the payload, enabling account creation or backdoor installation.

CVSS severity7.2
High
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WP Desk Flexible Checkout Fields for WooCommerce 2.3.1 and earlier allows remote attackers to store scripts via settings arrays. The updateSettingsAction() function in classes/settings.php runs on admin_init without a capability check and writes unsanitized POST arrays into plugin options that render as JavaScript. No account is required to change the settings, but a logged-in administrator must open an affected dashboard view to execute the payload, enabling account creation or backdoor installation.

The record

CVE
CVE-2020-36731
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
WP Desk
Product
Flexible Checkout Fields for WooCommerce
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2020Exploitation reportedFlexible Checkout Fields site-takeover campaign
  2. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  3. Apr 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 <2.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WP Desk · Flexible Checkout Fields for WooCommerceversion=0 <2.3.2

Published CVSS scores

7.2Wordfence CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
9.3Wordfence Threat IntelligenceCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/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
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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