CVE-2026-3003

High

Published: 21 March 2026

Published

21 March 2026

Modified

24 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS Score 0.0012 30.8th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3003 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Wordpress (inferred from references). Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 30.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2026-3003 is a stored cross-site scripting (XSS) vulnerability in the Vagaro Booking Widget plugin for WordPress, affecting all versions up to and including 0.3. The flaw stems from insufficient input sanitization and output escaping of the 'vagaro_code' parameter, enabling attackers to inject arbitrary web scripts into pages. It is classified under CWE-79 with a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N), indicating high severity due to its network accessibility, low attack complexity, lack of required privileges or user interaction, and scope change.

Unauthenticated attackers can exploit this vulnerability remotely by submitting malicious payloads via the 'vagaro_code' parameter, which get stored and executed in the browsers of any users who subsequently access the affected pages. Successful exploitation allows script execution in the context of the site, potentially leading to session hijacking, defacement, or theft of sensitive data like credentials, with low confidentiality and integrity impacts but no availability disruption.

Advisories reference source code locations in the plugin at lines 104 and 230 of vagaro-booking-widget.php on the WordPress plugin trac, along with Wordfence threat intelligence detailing the vulnerability (ID: 7a480473-ceae-4621-9b13-e0f0543c57e3). No specific patch details are outlined beyond implying upgrades beyond version 0.3, with practitioners advised to review these sources for sanitization fixes.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-14185

Vulnerability details

The Vagaro Booking Widget plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘vagaro_code’ parameter in all versions up to, and including, 0.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers…

to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

T1491.002 External Defacement Impact

An adversary may deface systems external to an organization in an attempt to deliver messaging, intimidate, or otherwise mislead an organization or users.

attack.mitre.org →

T1539 Steal Web Session Cookie Credential Access

An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.

attack.mitre.org →

Why these techniques?

Stored XSS in public-facing WordPress plugin directly enables remote script injection/execution (T1190, T1059.007), browser session hijacking/cookie theft (T1185, T1539), and defacement (T1491.002).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1