CVE-2023-0559Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode attributes

Published Feb 21, 2023 · Updated Mar 14, 2025

Stored XSS in GS Portfolio for Envato before 1.4.0 allows remote authenticated users to inject script through a shortcode attribute. The gs_envato shortcode outputs attacker-controlled theme attribute content into page markup without validation or context-appropriate escaping. Contributor-level access is required to save the shortcode, and script executes when another user hovers over the rendered portfolio element.

CVSS severity5.4
Medium
EPSS probability0.46%
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 GS Portfolio for Envato before 1.4.0 allows remote authenticated users to inject script through a shortcode attribute. The gs_envato shortcode outputs attacker-controlled theme attribute content into page markup without validation or context-appropriate escaping. Contributor-level access is required to save the shortcode, and script executes when another user hovers over the rendered portfolio element.

The record

CVE
CVE-2023-0559
Published
Feb 21, 2023
Updated
Mar 14, 2025
Vendor
GS Plugins
Product
GS Portfolio for Envato
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 14, 2025Record 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 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GS Plugins · GS Portfolio for Envatoversion=0 <1.4.0

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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 exploitPublished

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

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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