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Sonaar WordPress Theme CVE-2025-59560

| EUVDEUVD-2025-210221 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-06-17 Patchstack
7.1
CVSS 3.1 · Vendor: Patchstack
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Identify site running Sonaar theme
  2. Delivery
    Craft XSS payload for vulnerable parameter
  3. Exploit
    Deliver via link, comment, or referrer
  4. Execution
    Victim browser renders injected script
  5. Persist
    Steal session cookie or perform admin action
  6. Impact
    Establish persistence via new admin account

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires that the target WordPress site has the Sonaar theme installed and active at version 4.27.4 or earlier, and that a victim user interacts with attacker-controlled content (UI:R in CVSS) - typically clicking a crafted link, viewing an injected page, or loading a comment/profile field that reaches the vulnerable Sonaar template. No authentication is required from the attacker (PR:N), but the specific Sonaar feature, shortcode, or parameter that reflects unsanitized input is not disclosed in the available advisory data, so the exact entry point cannot be confirmed without consulting the Patchstack writeup. Maximum impact (admin takeover) further requires that the victim user be a logged-in WordPress administrator at the time of payload execution.

Impact

The CVSS 3.1 base score of 7.1 reflects network attack vector, low complexity, no privileges required, but mandatory user interaction (UI:R) combined with a scope change (S:C) and low partial impact across confidentiality, integrity, and availability - characteristic of stored/reflected XSS against WordPress sites. EPSS data was not provided in the input, and the vulnerability is not on CISA KEV, so there is no signal of mass automated exploitation; however, XSS against WordPress themes is a well-trodden path for credential and session theft and is often weaponized opportunistically once details are public. The Patchstack advisory exists but the input does not specify whether a POC is publicly published, so exploit maturity is uncertain. Overall this is a meaningful but not emergency-priority issue for sites running Sonaar - patch promptly but it is not on the same tier as RCE.

Exploit ScenarioDerived

An attacker crafts a malicious URL or comment containing a JavaScript payload targeting a vulnerable Sonaar-rendered parameter and lures a site administrator or visitor to click it (UI:R). When the page renders, the script executes in the victim's browser under the WordPress site's origin, allowing the attacker to steal session cookies, perform authenticated actions such as creating a new admin user, or pivot to backend WordPress compromise.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 17, 2026

Reflected or stored cross-site scripting in the Sonaar WordPress theme versions 4.27.4 and earlier allows remote unauthenticated attackers to inject malicious script into pages rendered to victims who follow a crafted link or interact with attacker-controlled content. The CVSS scope-change vector (S:C) indicates the injected script can impact resources beyond the vulnerable component, such as the WordPress admin session of a logged-in user. No public exploit identified at time of analysis, and the issue is not on CISA's KEV list.

RemediationAI

Upgrade the Sonaar theme to a version newer than 4.27.4 as published by the vendor; the exact fixed version is not stated in the provided intelligence, so consult the Patchstack advisory at https://patchstack.com/database/wordpress/theme/sonaar/vulnerability/wordpress-sonaar-theme-4-27-4-cross-site-scripting-xss-vulnerability and the Sonaar Music vendor changelog for the patched release identifier. As compensating controls while patching, deploy a web application firewall such as the Patchstack mTLS/vPatch service or Wordfence with rules that block reflected XSS payloads against theme endpoints, set a strict Content-Security-Policy header that disallows inline scripts (note this can break other themes/plugins that rely on inline JS), require administrators to use separate browser profiles to avoid session reuse, and audit any pages exposing Sonaar-rendered user input. Avoid temporarily switching themes only as a workaround unless a staging validation is performed, since theme changes can break widgets and customizations.

Affected VersionsENISA

Sonaar n/a ≤4.27.4

Affected Packages

euvd sonaar no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Sonaar is a commercial WordPress theme marketed to musicians, bands, and audio producers (CPE cpe:2.3:a:sonaar_music:sonaar). The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), meaning user-controlled input is reflected or stored into HTML output without proper output encoding or input sanitization. In a WordPress theme context this typically manifests in shortcodes, template parameters, search forms, comment fields, or AJAX endpoints exposed by the theme to unauthenticated visitors. Exploitation runs in the browser of the victim within the origin of the WordPress site, enabling theft of cookies, session tokens, or actions performed on behalf of an authenticated administrator if one is lured to the malicious payload.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Patchstack) PRIMARY 7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
vuln.today AI 7.1 HIGH

Network-reachable WordPress theme, unauthenticated attacker, but requires victim click (UI:R); XSS escapes component scope (S:C) with partial C/I/A impact on victim session.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

DescriptionCVE.org

Unauthenticated Cross Site Scripting (XSS) in Sonaar <= 4.27.4 versions.

Executive ViewAI

Why It Matters

Sonaar WordPress theme (v4.27.4 and earlier) contains an unauthenticated cross-site scripting vulnerability allowing attackers to inject malicious scripts into pages visited by users. Because the vulnerability has a changed scope vector, injected scripts can compromise WordPress administrator sessions, enabling unauthorized access to site administration and user data for any organization running affected theme versions.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: Deploy WAF with XSS protection rules; enforce strict Content Security Policy headers restricting external scripts; implement input validation and output encoding on theme customization fields; restrict file upload permissions; enable WordPress security monitoring plugins to detect exploitation attempts; maintain enhanced logging of WordPress admin activity; consider reverting to prior unaffected theme version if available; restrict theme updates to verified administrative personnel only.

Threat Intelligence Overview

EPSS Score
0.2%
Top 86% exploitable
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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