CVE-2023-0377Public exploitNetwork attack vector

Stored XSS via unescaped block CSS class

Published Mar 6, 2023 · Updated Mar 6, 2025

Stored XSS in Robin Cornett Scriptless Social Sharing before 3.2.2 allows remote authenticated users to run script in visitors' browsers. The Gutenberg block renders the Additional CSS class option into page markup without validation or attribute escaping, allowing a crafted quote-delimited value to add event-handler attributes. Contributor-level access is sufficient to save the payload in a post, and execution requires a visitor to view or preview the post and interact with the injected block.

CVSS severityUnavailable
Unscored
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Stored XSS in Robin Cornett Scriptless Social Sharing before 3.2.2 allows remote authenticated users to run script in visitors' browsers. The Gutenberg block renders the Additional CSS class option into page markup without validation or attribute escaping, allowing a crafted quote-delimited value to add event-handler attributes. Contributor-level access is sufficient to save the payload in a post, and execution requires a visitor to view or preview the post and interact with the injected block.

The record

CVE
CVE-2023-0377
Published
Mar 6, 2023
Updated
Mar 6, 2025
Vendor
Robin Cornett
Product
Scriptless Social Sharing
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 <3.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Robin Cornett · Scriptless Social Sharingversion=0 <3.2.2

Published CVSS scores

No CVSS assessment is available in this record.

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')
T1059.007JavaScript/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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