EUVD-2026-43388Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Reflected XSS is network-reachable and low-complexity with no attacker auth (PR:N) but needs victim click (UI:R); scope changes into browser context (S:C) with limited C/I/A impact.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
2DescriptionCVE.org
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in stmcan RT-Theme 18 | Extensions rt18-extensions allows Reflected XSS.This issue affects RT-Theme 18 | Extensions: from n/a through <= 2.5.
AnalysisAI
Reflected cross-site scripting in the stmcan RT-Theme 18 | Extensions WordPress plugin (all versions up to and including 2.5) lets remote attackers inject arbitrary JavaScript that executes in a victim's browser when they follow a crafted link. Because the CVSS scope is changed (S:C), a successful payload can affect resources beyond the vulnerable component, such as the WordPress session context. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the RT-Theme 18 | Extensions plugin (version ≤ 2.5) to be installed and active on the WordPress site, and - per CVSS UI:R - requires a victim to interact by loading an attacker-crafted request (e.g., clicking a malicious link) that carries the reflected XSS payload into the vulnerable parameter. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals paint a moderate, user-interaction-gated risk rather than an urgent internet-wide threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL to the vulnerable rt18-extensions endpoint containing a malicious script payload in a reflected parameter and delivers it to a logged-in site user or administrator via phishing email or a malicious link. When the victim clicks, the script executes in their browser under the site's origin, allowing session/cookie theft or actions performed as the victim; the low attack complexity makes crafting the payload straightforward, though the required user interaction limits scale. … |
| Remediation | No vendor-released patch version is identified in the available data (the advisory documents affected versions up to and including 2.5 without naming a fixed build), so administrators should monitor the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/rt18-extensions/vulnerability/wordpress-rt-theme-18-extensions-plugin-2-5-reflected-cross-site-scripting-xss-vulnerability and the stmcan/RT-Theme 18 vendor channel for an update newer than 2.5 and apply it as the primary fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all WordPress installations using stmcan RT-Theme 18 Extensions plugin versions 2.5 and below; deactivate the plugin immediately. …
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External POC / Exploit Code
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