VulnerabilityModified

CVE-2026-31982

An Open Redirect vulnerability was discovered in the SAML Single Sign-On functionality due to insufficient validation of a user-controlled redirection parameter.

MEDIUM 5.3EPSS 0.31%

Does this matter?

Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.

Description

An Open Redirect vulnerability was discovered in the SAML Single Sign-On functionality due to insufficient validation of a user-controlled redirection parameter. An unauthenticated attacker can craft a request to the SAML sign-in endpoint and poison the cached SAML redirection for other users who subsequently initiate SAML Single Sign-On, enabling phishing and credential-theft attacks, as well as disrupting SAML authentication for all affected users.

CVSS 4.0: 5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.31% probability · 23th percentile
CISA KEV: Not listed
Weakness: CWE-601
Affected: nozominetworks/cmc · nozominetworks/guardian
Source: prodsec@nozominetworks.com

References

https://security.nozominetworks.com/NN-2026:9-01Mitigation, Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-827968.html

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.