Which versions of Smart Sso are affected by CVE-2026-2971?

Organizations using a466350665 Smart-SSO should be aware of moderate risk from CVE-2026-2971, a cross-site scripting vulnerability rated CVSS 4.3.

Is there a public PoC exploit available for CVE-2026-2971?

Yes, a public proof-of-concept exploit is available for CVE-2026-2971. Prioritise patching immediately. EPSS: 0.0%.

Smart Sso CVE-2026-2971

Q: What is the CVSS score of CVE-2026-2971?

CVE-2026-2971 has a CVSS 4.0 base score of 2.1 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

LOW

Cross-site Scripting (XSS) (CWE-79)

2026-02-23 cna@vuldb.com

XSS Smart Sso

2.1

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.1 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

4.3 (MEDIUM) 2.1 (LOW)

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 25, 2026 - 15:11 vuln.today

Public exploit code

CVE Published

Feb 23, 2026 - 05:16 nvd

MEDIUM 4.3

DescriptionCVE.org

A vulnerability was found in a466350665 Smart-SSO up to 2.1.1. Affected by this issue is some unknown functionality of the file smart-sso-server/src/main/resources/templates/login.html of the component Login. Performing a manipulation of the argument redirectUri results in cross site scripting. The attack is possible to be carried out remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Smart SSO up to version 2.1.1 contains a reflected cross-site scripting vulnerability in the login page's redirectUri parameter that allows unauthenticated remote attackers to execute arbitrary JavaScript in users' browsers. Public exploit code exists for this vulnerability, and the vendor has not released a patch despite early disclosure notification.

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Vulnerability AssessmentAI

Risk Assessment	CVSS 4.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this flaw, cross site scripting.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running a466350665 Smart-SSO and apply vendor patches as part of regular patch cycle. …

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CVE-2026-2971 vulnerability details – vuln.today

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