How severe is CVE-2026-21836?

CVE-2026-21836 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-21836 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21836?

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

Does CVE-2026-21836 have an EU (EUVD) identifier?

Yes. CVE-2026-21836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31117.

When was CVE-2026-21836 published?

CVE-2026-21836 was published on 2026-05-20 and last updated on 2026-06-17.

CVE-2026-21836

CVE-2026-21836 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31117
Weakness: CWE-862
Published: 2026-05-20
Last modified: 2026-06-17

Description

The HCL DominoIQ RAG feature is affected by a Broken Access Control vulnerability. Under certain circumstances, document level access restrictions will be ignored when determining what data to return from an AI query. This could enable an authenticated attacker to view sensitive data.

Frequently asked questions

What is CVE-2026-21836?: The HCL DominoIQ RAG feature is affected by a Broken Access Control vulnerability. Under certain circumstances, document level access restrictions will be ignored when determining what data to return from an AI query. This could enable an authenticated attacker to view sensitive data.
How severe is CVE-2026-21836?: CVE-2026-21836 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-21836 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21836?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21836 have an EU (EUVD) identifier?: Yes. CVE-2026-21836 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31117.
When was CVE-2026-21836 published?: CVE-2026-21836 was published on 2026-05-20 and last updated on 2026-06-17.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130932

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