CVE-2023-0063Public exploitNetwork attack vector

Contributor-level stored XSS via unescaped shortcode attributes

Published Mar 6, 2023 · Updated Mar 6, 2025

Stored XSS in Synved WordPress Shortcodes 1.6.36 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The synved_tabs shortcode writes attacker-controlled class and style attributes into page output without validation or context-appropriate escaping. Contributor-level access is required to store the crafted shortcode, and the script executes in a visitor's browser when the injected page is viewed.

CVSS severity5.4
Medium
EPSS probability0.47%
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 Synved WordPress Shortcodes 1.6.36 and earlier allows remote authenticated users to inject scripts via shortcode attributes. The synved_tabs shortcode writes attacker-controlled class and style attributes into page output without validation or context-appropriate escaping. Contributor-level access is required to store the crafted shortcode, and the script executes in a visitor's browser when the injected page is viewed.

The record

CVE
CVE-2023-0063
Published
Mar 6, 2023
Updated
Mar 6, 2025
Vendor
Synved
Product
WordPress Shortcodes
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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 <=1.6.36

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Synved · WordPress Shortcodesversion=0 <=1.6.36

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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