CVE-2023-0539Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode attribute

Published Feb 27, 2023 · Updated Mar 11, 2025

Stored XSS in GS Plugins GS Insever Portfolio before 1.4.5 allows remote authenticated users to execute script through shortcode attributes. The gs_instagram shortcode outputs its id attribute without validation or escaping, allowing injected event-handler markup to persist and execute in a visitor's browser. Contributor-level access is required to embed the shortcode, and execution requires a visitor to interact with the rendered content.

CVSS severity5.4
Medium
EPSS probability0.53%
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 Plugins GS Insever Portfolio before 1.4.5 allows remote authenticated users to execute script through shortcode attributes. The gs_instagram shortcode outputs its id attribute without validation or escaping, allowing injected event-handler markup to persist and execute in a visitor's browser. Contributor-level access is required to embed the shortcode, and execution requires a visitor to interact with the rendered content.

The record

CVE
CVE-2023-0539
Published
Feb 27, 2023
Updated
Mar 11, 2025
Vendor
GS Plugins
Product
GS Insever Portfolio
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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 <1.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GS Plugins · GS Insever Portfolioversion=0 <1.4.5

Published CVSS scores

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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