Cyber Resilience

CVE-2025-53896

Accellion Kiteworks Managed File Transfer ≤ 9.1.0

Published
29 November 2025
Modified
02 December 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0019 9th percentile
Risk Priority 51 floored blend · peak EPSS

Summary

CVE-2025-53896 is a high-severity Insufficient Session Expiration (CWE-613) vulnerability in Accellion Kiteworks Managed File Transfer. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-12 (Session Termination) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

Kiteworks MFT orchestrates end-to-end file transfer workflows. Prior to version 9.1.0, a bug in Kiteworks MFT could cause under certain circumstances that a user's active session would not properly time out due to inactivity. This issue has been patched in…

more

version 9.1.0.

CWE(s)
CWE-613

Related Threats

MITRE ATT&CK Enterprise Techniques

T1185 Browser Session Hijacking Collection
Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.
attack.mitre.org →
T1550 Use Alternate Authentication Material Lateral Movement
Adversaries may use alternate authentication material, such as password hashes, Kerberos tickets, and application access tokens, in order to move laterally within an environment and bypass normal system access controls.
attack.mitre.org →
T1550.004 Web Session Cookie Lateral Movement
Adversaries can use stolen session cookies to authenticate to web applications and services.
attack.mitre.org →
T1563 Remote Service Session Hijacking Lateral Movement
Adversaries may take control of preexisting sessions with remote services to move laterally in an environment.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-29092Same product class: managed file transfer
CVE-2025-53897Same product: Accellion Kiteworks Managed File Transfer
CVE-2025-53900Same product: Accellion Kiteworks Managed File Transfer
CVE-2025-53899Same product: Accellion Kiteworks Managed File Transfer
CVE-2026-15967Same product class: managed file transfer
CVE-2026-0971Same product class: managed file transfer
CVE-2026-24752Same product class: managed file transfer
CVE-2026-24750Same product class: managed file transfer
CVE-2026-24754Same product class: managed file transfer
CVE-2026-28272Same product class: managed file transfer

Affected Assets

accellion
kiteworks managed file transfer
≤ 9.1.0

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

AC-12 Session Termination good match

AC-12 directly requires automatic session termination after a defined period, structurally preventing reuse of expired session identifiers.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-01 mostly match
prevents

Credential lifecycle management directly includes enforcing session expiration to prevent reuse.

PR.AA-05 mostly match
prevents

Authorization policy enforcement and review covers terminating stale sessions to limit access scope.

PR.AA-03 partial match
prevents

Authentication mechanisms can incorporate session timeout checks but do not inherently address expiration policy.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.5 Secure authentication none match
none

Automatic termination of inactive sessions and limits on connection duration shrink the window during which a hijacked or unattended authenticated session can be exploited.

References