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PatchSiren cyber security CVE debrief

CVE-2026-8939 simonailie CVE debrief

A Cross-Site Request Forgery (CSRF) vulnerability in the Search Simple Fields WordPress plugin allows unauthenticated attackers to modify plugin settings if they can trick an administrator into clicking a malicious link. The flaw exists in the `search_simple_fields_options()` function in `functions_admin.php` due to missing or incorrect nonce validation. Affected versions are up to and including 0.2. The vulnerability was published on 2026-05-27 with a CVSS 3.1 score of 4.3 (Medium). No known exploitation in ransomware campaigns has been reported.

Vendor
simonailie
Product
Search Simple Fields
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-27
Original CVE updated
2026-05-27
Advisory published
2026-05-27
Advisory updated
2026-05-27

Who should care

WordPress site administrators using the Search Simple Fields plugin, security teams monitoring WordPress plugin vulnerabilities, and developers maintaining WordPress installations with custom search functionality.

Technical summary

The Search Simple Fields plugin for WordPress versions up to and including 0.2 fails to properly validate nonces in the `search_simple_fields_options()` function located in `functions_admin.php`. This missing protection allows attackers to craft malicious requests that modify plugin configuration settings—including searchable post types, custom fields, media fields, and custom media function names—without proper authorization when an authenticated administrator unknowingly triggers the request. The vulnerability is classified as CWE-352 (Cross-Site Request Forgery).

Defensive priority

medium

Recommended defensive actions

  • Update the Search Simple Fields WordPress plugin to a version newer than 0.2 when available
  • Implement additional CSRF protections for administrative functions if maintaining a custom fork
  • Review plugin settings for unauthorized modifications if the site may have been targeted
  • Consider implementing Content Security Policy (CSP) and SameSite cookie attributes to mitigate CSRF risks
  • Monitor WordPress admin logs for unexpected setting changes to the Search Simple Fields plugin

Evidence notes

The vulnerability is documented in the WordPress plugin repository source code at lines 16 and 21 of functions_admin.php in version 0.2, as analyzed by Wordfence. The CVE record confirms CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8939 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8939

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

  • CVE-2026-8939 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8939

    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.