How severe is CVE-2026-21786?

CVE-2026-21786 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-21786 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21786?

CVE-2026-21786 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21786?

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

Does CVE-2026-21786 have an EU (EUVD) identifier?

Yes. CVE-2026-21786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9797.

When was CVE-2026-21786 published?

CVE-2026-21786 was published on 2026-03-05 and last updated on 2026-06-17.

CVE-2026-21786

CVE-2026-21786 is a low-severity vulnerability in Hcltech Sametime with a CVSS 3.x base score of 3.3. 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-532.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9797
Weakness: CWE-532
Affected product: Hcltech Sametime
Published: 2026-03-05
Last modified: 2026-06-17

Description

HCL Sametime for iOS is impacted by a sensitive information disclosure. Hostnames information is written in application logs and certain URLs.

Frequently asked questions

What is CVE-2026-21786?: HCL Sametime for iOS is impacted by a sensitive information disclosure. Hostnames information is written in application logs and certain URLs.
How severe is CVE-2026-21786?: CVE-2026-21786 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-21786 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21786?: CVE-2026-21786 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21786?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21786 have an EU (EUVD) identifier?: Yes. CVE-2026-21786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9797.
When was CVE-2026-21786 published?: CVE-2026-21786 was published on 2026-03-05 and last updated on 2026-06-17.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0128949

Affected products (1)

cpe:2.3:a:hcltech:sametime:*:*:*:*:*:iphone_os:*:*

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