EUVD-2026-45135
GHSA-m8qm-p7f3-7xr7
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires victim to load injected page (UI:R); contributor auth required (PR:L); scope changes to victim browser (S:C); no server availability impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
The ChatHelp - Click to Chat Button, WooCommerce Chat to Order & Floating Chat Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'number' and 'group' Shortcode Attributes in all versions up to, and including, 3.5.1 due to insufficient input sanitization and output escaping. 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.
AnalysisAI
Stored Cross-Site Scripting in the ChatHelp plugin for WordPress (versions through 3.5.1) allows authenticated attackers with contributor-level access to inject persistent malicious scripts via the 'number' and 'group' shortcode attributes, which execute in victims' browsers on page load. The vulnerability stems from insufficient input sanitization and output escaping in the shortcode rendering layer, identified across multiple source files in CustomButtonsTemplates.php and CustomShortcode.php. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an authenticated WordPress account with at least contributor-level privileges (PR:L per CVSS vector) - unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N) is Medium severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker registers or already holds a contributor-level WordPress account on a target site and edits or creates a page embedding a ChatHelp shortcode with a crafted 'number' or 'group' attribute containing a JavaScript payload. When any site visitor - including administrators - subsequently loads the injected page, the stored script executes in their browser, potentially stealing session cookies, redirecting to phishing pages, or performing actions on behalf of the victim. … |
| Remediation | An upstream fix is available in the WordPress plugin repository as changeset 3609732 (https://plugins.trac.wordpress.org/changeset?reponame=&old=3609732%40chat-help&new=3609732%40chat-help); however, the exact patched release version number is not independently confirmed from the available data - administrators should update to the latest available version of ChatHelp in the WordPress plugin dashboard and verify the installed version exceeds 3.5.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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