Vulnerability

CVE-2026-21826

Medium· 6.1CVSS6.1EPSS0%

.rules3/5

HCL Digital Experience and HCL Digital Experience Compose could be susceptible to Host header injection. An attacker can manipulate the Host header and cause the application to behave in unexpected ways.

Threat signal

61/100

Elevated

Severity

medium

CVSS

6.1

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.1/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeChangedImpact extends beyond the vulnerable component (e.g. sandbox escape).
Confidentiality ImpactLowSome data disclosure; attacker doesn't fully control what.
Integrity ImpactLowSome data modification; attacker doesn't fully control extent.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.03%

probability of exploitation in next 30 days

higher than 9% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-21826. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-05Published
2026-06-10Last modified1 source

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130849

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.