How severe is CVE-2026-21759?

CVE-2026-21759 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-21759 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21759?

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

When was CVE-2026-21759 published?

CVE-2026-21759 was published on 2026-08-24 and last updated on 2026-08-28.

CVE-2026-21759

CVE-2026-21759 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. 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-215.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-215
Published: 2026-08-24
Last modified: 2026-08-28

Description

HCL Hive is affected by an information exposure vulnerability where Swagger documentation was found exposed publicly. Although no sensitive information (e.g., credentials, PII) was discovered, exposing API documentation to unauthenticated users can increase the overall attack surface.

Frequently asked questions

What is CVE-2026-21759?: HCL Hive is affected by an information exposure vulnerability where Swagger documentation was found exposed publicly. Although no sensitive information (e.g., credentials, PII) was discovered, exposing API documentation to unauthenticated users can increase the overall attack surface.
How severe is CVE-2026-21759?: CVE-2026-21759 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-21759 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21759?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-21759 published?: CVE-2026-21759 was published on 2026-08-24 and last updated on 2026-08-28.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0131731

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