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Simple Link Directory CVE-2026-57682

| EUVDEUVD-2026-41291 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-07-02 Patchstack GHSA-9547-xvvm-938r
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
    Craft malicious script payload
  2. Delivery
    Deliver via link or directory submission
  3. Exploit
    Victim views affected plugin page
  4. Execution
    Script executes in browser context
  5. Impact
    Hijack session or perform actions as victim

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 vulnerable Simple Link Directory plugin (<= 15.0.5) be installed and its affected front-end feature (submission, search, or listing rendering) be reachable by anonymous users, and it requires user interaction (UI:R) - a victim must open an attacker-crafted link or view attacker-supplied directory content for the payload to fire. No authentication is needed (PR:N), so any unauthenticated attacker can plant or deliver the payload. The primary limiting factors are the need to lure a victim into interacting and the client-side-only impact (Low C/I/A); the most valuable outcomes depend on a privileged user (e.g., an admin) being the one who triggers the script. The exact injectable parameter and whether the XSS is reflected or stored are not specified in the provided data.

Impact

The signals are moderate and largely consistent. CVSS is 7.1 (High) driven by network reach and no privileges (AV:N/AC:L/PR:N) plus a scope change (S:C), but the required user interaction (UI:R) and only Low confidentiality/integrity/availability impacts temper the real-world severity - this is a client-side script-execution flaw, not server-side code execution. No EPSS score was supplied in the input, so exploitation probability cannot be quantified here. KEV status is not present (not actively exploited) and no POC is referenced, so this is a credible but not urgent priority relative to actively exploited or wormable issues. One caveat: the CVSS vector claims network vector with no privileges, which fits an unauthenticated XSS, but the specific injection sink (reflected vs stored) is not stated in the source data and should be confirmed against the Patchstack advisory, since a stored variant would raise practical risk.

Exploit ScenarioDerived

An attacker crafts a URL or directory-submission payload containing malicious JavaScript that the Simple Link Directory plugin renders without sanitization, then distributes the link via email, social media, or a comment. When a victim (potentially a logged-in administrator) clicks or views the page, the script runs in their browser session and can steal cookies, forge admin actions, or redirect them. No public exploit code is identified at time of analysis, but the low attack complexity (AC:L) makes weaponization straightforward for anyone who identifies the injection point.

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 – Jul 02, 2026

Cross-site scripting in the Simple Link Directory WordPress plugin (versions 15.0.5 and earlier, by QuantumCloud) allows unauthenticated remote attackers to inject malicious script that executes in a victim's browser after they interact with a crafted link or page. The CVSS 3.1 vector (AV:N/PR:N/UI:R/S:C) indicates no authentication is required but a user must be lured into triggering the payload, and the changed scope reflects script execution crossing into the browser security context. There is no public exploit identified at time of analysis, and the flaw is not listed in CISA KEV.

RemediationAI

Upgrade the Simple Link Directory plugin to the vendor-fixed release above 15.0.5 as soon as it is confirmed available; No vendor-released patch version identified at time of analysis in the provided data, so consult the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/qc-simple-link-directory/vulnerability/wordpress-simple-link-directory-plugin-15-0-5-cross-site-scripting-xss-vulnerability) and the WordPress plugin repository for the exact patched version. Until a patch is applied, place a WAF or virtual patch (Patchstack offers one) in front of the site to filter XSS payloads on the plugin's endpoints - note WAF rules can produce false positives on legitimate rich input. As a stronger compensating control, disable or restrict public access to the plugin's front-end submission and search features (for example, require login before directory submissions or remove the affected shortcode/page), accepting the trade-off of reduced directory functionality; additionally deploy a strict Content-Security-Policy that blocks inline script to limit payload execution, understanding it may break other inline scripts on the site.

Affected VersionsENISA

Simple Link Directory n/a ≤15.0.5

Affected Packages

euvd simple_link_directory 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

The affected component is Simple Link Directory (CPE cpe:2.3:a:quantumcloud:simple_link_directory), a WordPress plugin from vendor QuantumCloud used to build categorized link/business directories on WordPress sites. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), meaning user-supplied input is reflected or stored into HTML output without adequate sanitization or output encoding. Because the attack is described as unauthenticated (PR:N), the injection point is reachable by anonymous users - typically a front-end directory submission form, search parameter, or listing field processed by the plugin. When the tainted data is rendered, an attacker-controlled <script> or event handler executes in the context of the served page.

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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

Unauthenticated network-reachable XSS (AV:N/PR:N) needing victim interaction (UI:R); script crosses into browser context (S:C) with limited client-side C/I/A impact.

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:N/VI:N/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 Simple Link Directory <= 15.0.5 versions.

Executive ViewAI

Why It Matters

The Simple Link Directory WordPress plugin (QuantumCloud, versions ≤15.0.5) contains an unauthenticated cross-site scripting vulnerability allowing attackers to inject malicious scripts that execute when users interact with compromised pages or links. This directly threatens customer data security and organizational reputation through potential credential theft, session hijacking, and data exfiltration. Immediate remediation is critical as no vendor patch is currently available.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: (1) Plugin deactivation if operationally feasible; (2) Web Application Firewall rules to block XSS payload patterns; (3) Content Security Policy (CSP) headers restricting inline script execution; (4) HTTP security headers (X-XSS-Protection, X-Content-Type-Options); (5) regular website scanning for exploitation indicators; (6) migration to maintained directory plugin alternatives.

Threat Intelligence Overview

EPSS Score
0.2%
Top 91% exploitable
Prevalence
Low
niche QuantumCloud WordPress directory plugin, modest install base
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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