CVE-2025-67555 MEDIUM

CVE-2025-67555: WordPress UseStrict's Calendly Embedder plugin <= 1.1.7.2 - Cross Site Scripting (XSS) vulnerability

Vendor Usestrict
Product UseStrict's Calendly Embedder
Weakness CWE-79 · XSS
Published December 9, 2025
Last update April 28, 2026

CVSS base score

5.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in useStrict UseStrict's Calendly Embedder cal-embedder-lite allows Stored XSS.This issue affects UseStrict's Calendly Embedder: from n/a through <= 1.1.7.2.

Explanation of Vulnerability in Simple Terms

02Summary

UseStrict's Calendly Embedder versions up to 1.1.7.2 contain a cross-site scripting (XSS) vulnerability. An authenticated administrator with high privileges can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction and can affect the confidentiality, integrity, and availability of the site.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers when they visit the site.

Potential impact on your site

04Site Impact

An admin account could be compromised to inject scripts affecting other users' sessions and data.

Conditions required to exploit

05Prerequisites

Attacker must have high-level admin privileges and the victim must visit a page containing the injected payload.

Key dates

06Disclosure timeline

December 9, 2025 CVE published
April 28, 2026 Record updated