Microsoft Confluence SAML SSO plugin: Incorrect Implementation of Authentication Algorithm
CVE-2026-41103 is a critical-severity incorrect implementation of authentication algorithm vulnerability in Microsoft Confluence SAML SSO plugin from Microsoft, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 7.4.0 as the first without the flaw, so updating Microsoft Confluence SAML SSO plugin to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 5.38% chance of exploitation within 30 days, which is in the top 7.21% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Microsoft Confluence SAML SSO plugin to 7.4.0 or a later version.
- Update Microsoft JIRA SAML SSO plugin to 1.3.3 or a later version.
- Update Confluence Saml Sso to 7.4.0 or a later version.
- Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Microsoft | Microsoft Confluence SAML SSO plugin | 1.0.0 up to, but not including, 7.4.0 | 7.4.0 |
| Microsoft | Microsoft JIRA SAML SSO plugin | 1.0.0 up to, but not including, 1.3.3 | 1.3.3 |
| Microsoft | Confluence Saml Sso | before 7.4.0 | 7.4.0 |
| Microsoft | Jira Saml Sso | before 1.3.3 | 1.3.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. Scored by CNA (microsoft.com).
Official description
Incorrect implementation of authentication algorithm in Microsoft SSO Plugin for Jira & Confluence allows an unauthorized attacker to elevate privileges over a network.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Incorrect Implementation of Authentication Algorithm
The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.
More Incorrect Implementation of Authentication Algorithm vulnerabilities (CWE-303)
Timeline
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Recent Incorrect Implementation of Authentication Algorithm vulnerabilities
- 8.1 High severity
- 7.5 High severity
- 8.8 High severity
- 9.8 Critical severity
- 8.1 High severity
- 8.8 High severity
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