How severe is CVE-2025-31966?

CVE-2025-31966 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-31966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-31966?

CVE-2025-31966 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-31966?

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

Does CVE-2025-31966 have an EU (EUVD) identifier?

Yes. CVE-2025-31966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208777.

When was CVE-2025-31966 published?

CVE-2025-31966 was published on 2026-03-17 and last updated on 2026-06-17.

CVE-2025-31966

CVE-2025-31966 is a low-severity vulnerability in Hcltech Sametime with a CVSS 3.x base score of 2.7. 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-20.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-208777
Weakness: CWE-20
Affected product: Hcltech Sametime
Published: 2026-03-17
Last modified: 2026-06-17

Description

HCL Sametime is vulnerable to broken server-side validation. While the application performs client-side input checks, these are not enforced by the web server. An attacker can bypass these restrictions by sending manipulated HTTP requests directly to the server.

Frequently asked questions

What is CVE-2025-31966?: HCL Sametime is vulnerable to broken server-side validation. While the application performs client-side input checks, these are not enforced by the web server. An attacker can bypass these restrictions by sending manipulated HTTP requests directly to the server.
How severe is CVE-2025-31966?: CVE-2025-31966 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-31966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-31966?: CVE-2025-31966 affects Hcltech Sametime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-31966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-31966 have an EU (EUVD) identifier?: Yes. CVE-2025-31966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208777.
When was CVE-2025-31966 published?: CVE-2025-31966 was published on 2026-03-17 and last updated on 2026-06-17.

References

https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0124722

Affected products (1)

cpe:2.3:a:hcltech:sametime:*:*:*:*:*:-:*:*

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