CVE-2026-3862Network attack vector

Authenticated browser script execution via unescaped data

Published Mar 10, 2026 · Updated Mar 10, 2026

Cross-site scripting in Broadcom SiteMinder 12.8.x and 12.9 allows remote authenticated users to execute script via crafted data. The Administrative UI returns attacker-controlled data unaltered in a generated page; Broadcom has not identified the affected parameter or handler. High-privilege access and active victim interaction are required, and the script can read or alter data available to the victim's UI session.

CVSS severity4.6
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Broadcom SiteMinder 12.8.x and 12.9 allows remote authenticated users to execute script via crafted data. The Administrative UI returns attacker-controlled data unaltered in a generated page; Broadcom has not identified the affected parameter or handler. High-privilege access and active victim interaction are required, and the script can read or alter data available to the victim's UI session.

The record

CVE
CVE-2026-3862
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Brocade Communications Systems
Product
SiteMinder
Classifications
CWE-79, CAPEC-63, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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=12.8.x
  2. Affected versionversion=12.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Brocade Communications Systems · SiteMinderversion=12.8.x; version=12.9

Published CVSS scores

4.8NISTCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.6Symantec CorporationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-63Cross-Site Scripting (XSS)
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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