CVE-2026-2971Public exploitNetwork attack vector

Reflected XSS via unescaped redirectUri attribute

Published Feb 23, 2026 · Updated Feb 23, 2026

Reflected cross-site scripting in Smart-SSO 2.1.0 and 2.1.1 allows remote attackers to execute script in a user's browser via redirectUri. The login.html template inserts redirectUri directly into a hidden input's value attribute without HTML attribute encoding. A victim must open a crafted login URL, after which attacker-supplied script runs in the Smart-SSO origin and can alter page content.

CVSS severity6.1
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in Smart-SSO 2.1.0 and 2.1.1 allows remote attackers to execute script in a user's browser via redirectUri. The login.html template inserts redirectUri directly into a hidden input's value attribute without HTML attribute encoding. A victim must open a crafted login URL, after which attacker-supplied script runs in the Smart-SSO origin and can alter page content.

The record

CVE
CVE-2026-2971
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
openjoe
Product
Smart-SSO
Classifications
CWE-94, CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1.0
  2. Affected versionversion=2.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

openjoe · Smart-SSOversion=2.1.0; version=2.1.1

Published CVSS scores

2.1VulDBCVSS: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
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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