CVE-2026-21826Network attack vector

User-assisted open redirect via manipulated Host header

Published Jun 5, 2026 · Updated Jun 5, 2026

Host header injection in HCL Digital Experience and DX Compose 9.5 allows remote attackers to redirect users through crafted requests. HCL has not published the affected request-handling locus or how it uses an untrusted Host value to construct a redirect target. A user must interact with the malicious redirect; successful exploitation sends the browser to an attacker-selected site without crashing the service.

CVSS severity6.1
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in HCL Digital Experience and DX Compose 9.5 allows remote attackers to redirect users through crafted requests. HCL has not published the affected request-handling locus or how it uses an untrusted Host value to construct a redirect target. A user must interact with the malicious redirect; successful exploitation sends the browser to an attacker-selected site without crashing the service.

The record

CVE
CVE-2026-21826
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1HCL SoftwareCVSS: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 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

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution: Malicious Link

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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