CVE-2026-66253

Unauthorized account actions via lingering sessions

Published Oct 1, 2026 · Updated Oct 1, 2026

Session timeout failure in HCL iControl 4.5.0 allows attackers to use an unattended active session to act as its user. The application leaves the authenticated session usable when an active session is abandoned; HCL has not published the specific timeout logic at fault. Exploitation requires access to that session, and resulting actions have the victim's application permissions.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session timeout failure in HCL iControl 4.5.0 allows attackers to use an unattended active session to act as its user. The application leaves the authenticated session usable when an active session is abandoned; HCL has not published the specific timeout logic at fault. Exploitation requires access to that session, and resulting actions have the victim's application permissions.

The record

CVE
CVE-2026-66253
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
HCL Software
Product
HCL iControl
Classifications
T1078
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2026Record 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=v4.5.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

HCL Software · HCL iControlversion=v4.5.0

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1078Valid Accounts

Public exploit references

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Technologies

Your stack

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Your stack

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