How severe is CVE-2026-21785?

CVE-2026-21785 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-21785 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.

How do I fix CVE-2026-21785?

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

Does CVE-2026-21785 have an EU (EUVD) identifier?

Yes. CVE-2026-21785 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32658.

When was CVE-2026-21785 published?

CVE-2026-21785 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-21785

CVE-2026-21785 is a medium-severity vulnerability with a CVSS 3.x base score of 4.0. 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-1021.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32658
Weakness: CWE-1021
Published: 2026-05-27
Last modified: 2026-06-17

Description

A misconfigured Content Security Policy (CSP) in HCL BigFix Remote Control Server WebUI (versions 10.1.0.0442 and earlier) fails to define directives without fallbacks, allowing attackers to bypass intended security restrictions and load unauthorized resources.

Frequently asked questions

What is CVE-2026-21785?: A misconfigured Content Security Policy (CSP) in HCL BigFix Remote Control Server WebUI (versions 10.1.0.0442 and earlier) fails to define directives without fallbacks, allowing attackers to bypass intended security restrictions and load unauthorized resources.
How severe is CVE-2026-21785?: CVE-2026-21785 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-21785 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.
How do I fix CVE-2026-21785?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21785 have an EU (EUVD) identifier?: Yes. CVE-2026-21785 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32658.
When was CVE-2026-21785 published?: CVE-2026-21785 was published on 2026-05-27 and last updated on 2026-06-17.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130581

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