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CVE-2026-53741 quantumcloud CVE debrief

CVE-2026-53741 is a stored cross-site scripting (XSS) vulnerability in the Simple Link Directory plugin through version 9.0.4. The vulnerability occurs because the plugin interpolates the sld_no_results_found option into a JavaScript string literal without proper encoding. Specifically, the sanitize_text_field function leaves quotes intact, allowing a stored payload to break out of the string and execute script for every page visitor. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 5.1, indicating a MEDIUM severity level. The CVSS vector is CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Vendor
quantumcloud
Product
Simple Link Directory
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of the Simple Link Directory plugin, particularly those who allow user input or manage directory listings, should be aware of this vulnerability. The vulnerability requires a low-privileged user to inject malicious payload, which then affects all visitors to the pages displaying the directory.

Technical summary

The vulnerability is caused by inadequate encoding of user-input data (sld_no_results_found option) into JavaScript string literals. The sanitize_text_field function does not remove quotes, allowing attackers to inject and execute arbitrary JavaScript code.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update Simple Link Directory to a version beyond 9.0.4 if available.
  • Validate and sanitize all user inputs, especially those reflected in JavaScript contexts.
  • Implement Content Security Policy (CSP) to mitigate XSS attacks.
  • Regularly review and update plugins and themes to prevent exploitation of known vulnerabilities.

Evidence notes

Evidence suggests that the vendor of the Simple Link Directory plugin is likely the WordPress community, given the reference to the WordPress plugin directory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53741 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53741

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53741 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53741

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.