Microsoft SSO Plugin for Jira & Confluence Critical Auth Bypass
The National Vulnerability Database has disclosed CVE-2026-41103, a critical vulnerability in the Microsoft SSO Plugin for Jira & Confluence. This flaw, rated 9.1 CVSS, stems from an incorrect implementation of the authentication algorithm, enabling unauthorized attackers to achieve privilege escalation over the network.
This isn’t a complex, multi-stage attack. It’s a direct authentication bypass, allowing an attacker to gain elevated access without legitimate credentials. Given Jira and Confluence’s common role in housing sensitive internal documentation and project management, this vulnerability represents a direct path to critical data and potentially broader network compromise.
Defenders need to treat this as an immediate threat. An authentication bypass on core collaboration platforms is a CISO’s nightmare. Assume an attacker will leverage this quickly given its severity and ease of exploitation. Patching or mitigating this must be a top priority to prevent unauthorized access to sensitive internal systems.
What This Means For You
- If your organization uses the Microsoft SSO Plugin for Jira or Confluence, you have a critical authentication bypass on your hands. Immediately identify all instances running this plugin and prepare to patch or implement vendor-recommended mitigations. Audit logs for any suspicious activity or unauthorized access attempts against these platforms.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-41103 - Microsoft SSO Plugin Auth Bypass - Initial Access
title: CVE-2026-41103 - Microsoft SSO Plugin Auth Bypass - Initial Access
id: scw-2026-05-12-ai-1
status: experimental
level: critical
description: |
Detects the initial access attempt exploiting CVE-2026-41103 by looking for specific callback URIs associated with the Microsoft SSO Plugin for Jira and Confluence, often resulting in a redirect (302) after a successful authentication bypass.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-41103/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/plugins/servlet/oauth/suites/microsoft/callback'
cs-method:
- 'GET'
sc-status:
- '302'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-41103 | Privilege Escalation | Microsoft SSO Plugin for Jira & Confluence |
| CVE-2026-41103 | Auth Bypass | Incorrect implementation of authentication algorithm |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 12, 2026 at 21:17 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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