How severe is CVE-2026-41103?

CVE-2026-41103 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-41103 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41103?

CVE-2026-41103 primarily affects Microsoft Confluence Saml Sso. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-41103?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-41103 have an EU (EUVD) identifier?

Yes. CVE-2026-41103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29689.

When was CVE-2026-41103 published?

CVE-2026-41103 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-41103

CVE-2026-41103 is a critical-severity vulnerability in Microsoft Confluence Saml Sso with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-303.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29689
Weakness: CWE-303
Affected product: Microsoft Confluence Saml Sso
Published: 2026-05-12
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-41103?: Incorrect implementation of authentication algorithm in Microsoft SSO Plugin for Jira & Confluence allows an unauthorized attacker to elevate privileges over a network.
How severe is CVE-2026-41103?: CVE-2026-41103 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-41103 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41103?: CVE-2026-41103 primarily affects Microsoft Confluence Saml Sso. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-41103?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-41103 have an EU (EUVD) identifier?: Yes. CVE-2026-41103 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29689.
When was CVE-2026-41103 published?: CVE-2026-41103 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41103

Affected products (2)

cpe:2.3:a:microsoft:confluence_saml_sso:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:jira_saml_sso:*:*:*:*:*:*:*:*

Other CWE-303 vulnerabilities

CVE-2025-13390 — Critical (CVSS 10.0): The WP Directory Kit plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including,…
CVE-2025-12421 — Critical (CVSS 9.9): Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to to verify that…
CVE-2025-12419 — Critical (CVSS 9.9): Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly…
CVE-2025-66489 — Critical (CVSS 9.8): Cal.com is open-source scheduling software. Prior to 5.9.8, A flaw in the login credentials provider allows an attacker…
CVE-2025-21311 — Critical (CVSS 9.8): Windows NTLM V1 Elevation of Privilege Vulnerability
CVE-2024-10127 — Critical (CVSS 9.8): Authentication bypass condition in LDAP authentication in M-Files server versions before 24.11 supported usage of…

Browse all CWE-303 vulnerabilities →