How severe is CVE-2026-21791?

CVE-2026-21791 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-2026-21791 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21791?

CVE-2026-21791 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21791?

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

Does CVE-2026-21791 have an EU (EUVD) identifier?

Yes. CVE-2026-21791 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10488.

When was CVE-2026-21791 published?

CVE-2026-21791 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-21791

CVE-2026-21791 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% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10488
Weakness: CWE-532
Affected product: Hcltech Sametime
Published: 2026-03-10
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-21791?: HCL Sametime for Android is impacted by a sensitive information disclosure. Hostnames information is written in application logs and certain URL
How severe is CVE-2026-21791?: CVE-2026-21791 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-2026-21791 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21791?: CVE-2026-21791 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21791?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21791 have an EU (EUVD) identifier?: Yes. CVE-2026-21791 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10488.
When was CVE-2026-21791 published?: CVE-2026-21791 was published on 2026-03-10 and last updated on 2026-06-17.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0129451

Affected products (1)

cpe:2.3:a:hcltech:sametime:*:*:*:*:*:android:*:*

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