External risk intelligence

Attacker can gain admin control of Jira and Confluence over the internet

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-41103

A critical flaw in the Microsoft SSO Plugin for Jira and Confluence allows unauthorized attackers to gain administrative control remotely, potentially exposing sensitive company data.

4Halo Surface Signal

Microsoft Confluence Saml Sso

before 7.4.0before 1.3.3

External exposure likelihood

Halo Surface Signal score for CVE-2026-41103

Jira and Confluence are widely deployed web-based collaboration platforms. The vulnerable SSO plugin functions as an authentication handler within these applications. As authentication interfaces for web services are frequently exposed to the internet to support remote user access, the vulnerable code path is commonly reachable in typical enterprise web deployments.

Horizon Alert

Summary of the vulnerability and why it matters

An issue in how the Microsoft SSO Plugin for Jira and Confluence handles authentication allows an attacker to gain elevated privileges over a network. This vulnerability means that someone could potentially access more than they should within these systems.

  • Unrestricted network access for attackers.
  • High impact to data confidentiality and integrity.
  • Affects common collaboration tools.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can exploit this vulnerability by sending a crafted request over the network to a vulnerable Jira or Confluence instance. This request will bypass authentication checks due to the flawed implementation of the SSO plugin, allowing the attacker to gain elevated privileges within the affected application. This could lead to unauthorized access to sensitive data or further compromise of the system.

  • No network authentication needed.
  • Exploits SSO plugin logic.
  • Attack over the network.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows unauthorized privilege escalation over a network due to an incorrect authentication implementation. Attackers are likely to target this because it affects widely deployed Jira and Confluence SSO plugins, potentially offering broad access to sensitive information. The vulnerability is accessible remotely, increasing its appeal for exploitation.

  • Affects common collaboration tools.
  • Allows remote privilege escalation.
  • No public exploit details yet.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize patching or upgrading the Microsoft SSO Plugin for Jira and Confluence to address a critical authentication vulnerability. If immediate patching is not feasible, isolate affected services to prevent unauthorized privilege escalation until mitigations can be applied.

  • Upgrade to patched versions.
  • Isolate services if patching is delayed.
  • Monitor for unauthorized access attempts.

Frequently asked questions

What is the Microsoft SSO Plugin for Jira & Confluence?

The Microsoft SSO Plugin for Jira and Confluence facilitates single sign-on, allowing users to authenticate once with their Microsoft Entra ID credentials to access both Atlassian applications. It is designed for on-premises versions of Jira and Confluence and utilizes SAML 2.0 for authentication.

How does CVE-2026-41103 enable privilege escalation?

CVE-2026-41103 is a critical vulnerability that arises from an incorrect implementation of the authentication algorithm within the Microsoft SSO Plugin for Jira & Confluence. This flaw allows an unauthenticated attacker to bypass normal security checks by submitting a crafted SAML response or authentication request, thereby gaining elevated privileges over a network without user interaction. This could lead to unauthorized access to sensitive data, source code, tickets, internal documentation, and...

What is the attack path for CVE-2026-41103?

An attacker can exploit CVE-2026-41103 by reaching the affected SSO endpoint over the network and submitting a crafted SAML response or authentication request. The plugin's flawed verification logic accepts this input, issuing a session bound to a privileged identity. This allows the attacker to then interact with Jira or Confluence as that user, accessing protected projects, spaces, and administrative APIs. The attack requires no network authentication, user interaction, or special privileges, and the attack...

What is the relevance of CVE-2026-41103?

This vulnerability is highly relevant because it affects widely deployed collaboration tools like Jira and Confluence, enabling remote privilege escalation. The Halo Surface Signal assesses this as 'Likely' due to the common exposure of web-based collaboration platforms to the internet, making the vulnerable code path frequently reachable. [cite:context] The critical impact, combined with the network-exploitability and lack of user interaction required, makes it a significant threat.

What are the recommended actions for CVE-2026-41103?

Organizations should immediately apply the fixed versions of the Microsoft SSO Plugin for Jira and Confluence as provided in Microsoft's advisories. It is crucial to inventory all affected Jira and Confluence instances to confirm their patch status. After patching, rotate session tokens, API tokens, and administrative credentials, and review audit logs for any unauthorized administrative changes. If immediate patching is not possible, isolating the affected services can help prevent unauthorized privilege...

References