CVE-2023-23889Network attack vector

Stored XSS via unsanitized shortcode attributes

Published Apr 25, 2023 · Updated Apr 28, 2026

Stored XSS in Fullworks Quick PayPal Payments 5.7.25 and earlier allows remote authenticated users to execute scripts via shortcodes. The plugin accepts user-supplied shortcode attributes without sufficient input sanitization or output escaping, then stores them in page content rendered to visitors. Contributor-level access is required to inject the payload, and the script runs when a user visits the affected page, enabling actions in that visitor's browser context.

CVSS severity6.5
Medium
EPSS probability0.36%
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 Fullworks Quick PayPal Payments 5.7.25 and earlier allows remote authenticated users to execute scripts via shortcodes. The plugin accepts user-supplied shortcode attributes without sufficient input sanitization or output escaping, then stores them in page content rendered to visitors. Contributor-level access is required to inject the payload, and the script runs when a user visits the affected page, enabling actions in that visitor's browser context.

The record

CVE
CVE-2023-23889
Published
Apr 25, 2023
Updated
Apr 28, 2026
Vendor
Fullworks Digital Ltd.
Product
Quick PayPal Payments
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=n/a <=5.7.25 changes=[{"at":"5.7.26","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fullworks Digital Ltd. · Quick PayPal Paymentsversion=n/a <=5.7.25 changes=[{"at":"5.7.26","status":"unaffected"}]

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
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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