CVE-2026-5754Network attack vector

Browser script execution via unsanitized ReturnTo parameter

Published Apr 14, 2026 · Updated Apr 14, 2026

Reflected XSS in Radware Alteon vADC 34.5.4.0 allows remote attackers to execute JavaScript in a victim's browser via a crafted link. The /protected/login route places the unsanitized ReturnTo parameter into a Microsoft SAML login redirect, causing the supplied script to be reflected and executed. Exploitation requires a victim to follow the link; script execution can expose session cookies or perform actions in the victim's browser context.

CVSS severity6.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Radware Alteon vADC 34.5.4.0 allows remote attackers to execute JavaScript in a victim's browser via a crafted link. The /protected/login route places the unsanitized ReturnTo parameter into a Microsoft SAML login redirect, causing the supplied script to be reflected and executed. Exploitation requires a victim to follow the link; script execution can expose session cookies or perform actions in the victim's browser context.

The record

CVE
CVE-2026-5754
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Radware
Product
Alteon vADC
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=34.5.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Radware · Alteon vADCversion=34.5.4.0

Published CVSS scores

6.1CISA-ADPCVSS: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.

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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 exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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