CVE-2023-23956Public exploitNetwork attack vector

Browser script execution via unencoded USERNAME parameter

Published May 30, 2023 · Updated Jan 14, 2025

Cross-site scripting in Broadcom Symantec SiteMinder Web Agent 12.5.2 allows remote attackers to execute script in a user's browser. The smpwservices.fcc password-services page passes the USERNAME query parameter directly to document.write, inserting unencoded HTML into the DOM. Exploitation requires a user to click a crafted URL; the injected script runs in the affected site's browser context and can read or alter page data.

CVSS severity5.4
Medium
EPSS probability3.08%
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 Symantec SiteMinder Web Agent 12.5.2 allows remote attackers to execute script in a user's browser. The smpwservices.fcc password-services page passes the USERNAME query parameter directly to document.write, inserting unencoded HTML into the DOM. Exploitation requires a user to click a crafted URL; the injected script runs in the affected site's browser context and can read or alter page data.

The record

CVE
CVE-2023-23956
Published
May 30, 2023
Updated
Jan 14, 2025
Vendor
Broadcom
Product
Symantec SiteMinder Web Agent
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record 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=12.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Broadcom · Symantec SiteMinder Web Agentversion=12.5.2

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4BroadcomCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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