CVE-2023-45718

Session hijacking via persistent authentication cookies

Published Feb 9, 2024 · Updated Jun 3, 2025

Insufficient session expiration in HCL Sametime 11.5 through 12.0.1 FP1 allows physically proximate attackers to reuse session cookies. Sametime Web marks sensitive cookie values as persistent and does not invalidate them when the user closes the session. Exploitation requires access to a user's browser cookie after session closure and exposes the still-authenticated session without altering data or service availability.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in HCL Sametime 11.5 through 12.0.1 FP1 allows physically proximate attackers to reuse session cookies. Sametime Web marks sensitive cookie values as persistent and does not invalidate them when the user closes the session. Exploitation requires access to a user's browser cookie after session closure and exposes the still-authenticated session without altering data or service availability.

The record

CVE
CVE-2023-45718
Published
Feb 9, 2024
Updated
Jun 3, 2025
Vendor
HCL Software
Product
HCL Sametime
Classifications
CWE-384, CWE-613, T1539
Attack vector
physical
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.5, 11.6, 11.6 IF1, 12.0, 12.0 FP1, 12.0.1, 12.0.1 FP1

What conditions does exploitation require?

Attack vectorphysical
Required privilegesauthenticated

What is affected?

HCL Software · HCL Sametimeversion=11.5, 11.6, 11.6 IF1, 12.0, 12.0 FP1, 12.0.1, 12.0.1 FP1

Published CVSS scores

3.9HCL SoftwareCVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation
CWE-613Insufficient Session Expiration
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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