How severe is CVE-2026-21826?

CVE-2026-21826 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-21826 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21826?

CVE-2026-21826 primarily affects Hcltech Digital Experience Compose. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-21826?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21826 have an EU (EUVD) identifier?

Yes. CVE-2026-21826 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34787.

When was CVE-2026-21826 published?

CVE-2026-21826 was published on 2026-06-05 and last updated on 2026-06-17.

CVE-2026-21826

CVE-2026-21826 is a medium-severity vulnerability in Hcltech Digital Experience Compose with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34787
Weakness: CWE-601
Affected product: Hcltech Digital Experience Compose
Published: 2026-06-05
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-21826?: 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.
How severe is CVE-2026-21826?: CVE-2026-21826 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-21826 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21826?: CVE-2026-21826 primarily affects Hcltech Digital Experience Compose. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-21826?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21826 have an EU (EUVD) identifier?: Yes. CVE-2026-21826 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34787.
When was CVE-2026-21826 published?: CVE-2026-21826 was published on 2026-06-05 and last updated on 2026-06-17.

References

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

Affected products (67)

cpe:2.3:a:hcltech:digital_experience_compose:9.5:-:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf224:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf225:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf226:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf227:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf228:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf229:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf230:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf231:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf232:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf233:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience_compose:9.5:cf234:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:-:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf17:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf171:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf172:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf173:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf18:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf181:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf182:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf183:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf184:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf19:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf191:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf192:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf193:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf194:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf195:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf196:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf197:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf198:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf199:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf200:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf201:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf202:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf203:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf204:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf205:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf206:*:*:*:*:*:*
cpe:2.3:a:hcltech:digital_experience:9.5:cf207:*:*:*:*:*:*

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