CVE-2025-53896

Continued authenticated access via persistent idle sessions

Published Nov 29, 2025 · Updated Dec 3, 2025

Insufficient session expiration in Kiteworks MFT before 9.1.0 allows local users to retain authenticated access through an idle session. Under undisclosed circumstances, the session-management logic fails to invalidate an active user session after the configured inactivity period. Exploitation requires low-privileged local access to an already active session and extends only the access that session already grants.

CVSS severity7.1
High
EPSS probability0.19%
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 Kiteworks MFT before 9.1.0 allows local users to retain authenticated access through an idle session. Under undisclosed circumstances, the session-management logic fails to invalidate an active user session after the configured inactivity period. Exploitation requires low-privileged local access to an already active session and extends only the access that session already grants.

The record

CVE
CVE-2025-53896
Published
Nov 29, 2025
Updated
Dec 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-613, T1078
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.1GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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No observations available

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

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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