CVE-2026-4080 | Easy Cart <= 1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

The Easy Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'add_to_cart' shortcode in all versions up to and including 1.8. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. Specifically, the ectp_add_to_cart() function uses sanitize_text_field() on shortcode attributes like 'itemid', 'product_name', 'product_desc', 'product_qty', and 'price' before inserting them into double-quoted HTML attributes. While sanitize_text_field() strips HTML tags, it does not escape double quote characters, allowing an attacker to break out of the HTML attribute context and inject arbitrary event handlers. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Published: 2026-06-02 Last update: 2026-06-02 Assigner: [email protected] Source: [email protected]

Conclusion & alert: CVE-2026-4080 is rated Low Risk (30.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-4080

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-02 0.04%

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-4080

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
3.1 2.7 [email protected]

Weakness enumeration for CVE-2026-4080

GitHub Security Advisory for CVE-2026-4080

GHSA-q97r-wcrr-7v9h · Severity: medium — The Easy Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ...

Affected software / configurations for CVE-2026-4080

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-4080

URL Tags
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L263
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L280
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L283
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L284
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L285
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L286
https://plugins.trac.wordpress.org/browser/easy-cart/tags/1.8/plugin.php#L287
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L263
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L280
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L283
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L284
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L285
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L286
https://plugins.trac.wordpress.org/browser/easy-cart/trunk/plugin.php#L287
https://www.wordfence.com/threat-intel/vulnerabilities/id/73615729-c32a-45f7-b2d8-5c978370e18c?source=cve
cvelogic Threat Intelligence