CVE-2023-45718: HCL Sametime is impacted by a failure to invalidate sessions

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-09 · updated 2026-06-17
Weakness: CWE-384

Description

Sametime is impacted by a failure to invalidate sessions. The application is setting sensitive cookie values in a persistent manner in Sametime Web clients. When this happens, cookie values can remain valid even after a user has closed out their session.

Affected products

HCL Software Sametime: from 11.5 before 12.0.2 — fixed in 12.0.2

How to fix

Upgrade to a fixed version: HCL Software Sametime 12.0.2. Check the vendor advisory for mitigations.

References

https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0109082
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0109082

Get alerted when CVE-2023-45718 or the next vulnerability affects your stack