CVE-2026-63182 LightSAML - Authentication Bypass

LightSAML < 4.7.1 and < 5.0.1 contains an authentication bypass caused by signature validation mismatch in SAML assertion processing, letting attackers bypass authentication or escalate privileges by exploiting assertion signature confusion, exploit requires attacker to capture a genuine signed assertion.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.15% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
30 October 2026
Updated
1 November 2026
Weakness
CWE-347

Vendor fix

Upgrade to versions 4.7.1 or 5.0.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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