CVE-2026-29092
Accellion Kiteworks ≤ 9.2.1
Raw vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:NSummary
CVE-2026-29092 is a medium-severity Insufficient Session Expiration (CWE-613) vulnerability in Accellion Kiteworks. Its CVSS base score is 4.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 15th 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.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-29092 is a session management vulnerability in the Kiteworks Email Protection Gateway component of Kiteworks, a private data network (PDN). Prior to version 9.2.1, the flaw allows users whose accounts have been blocked or disabled to retain active sessions, enabling continued access until the sessions naturally expire. The vulnerability is classified under CWE-613 (Insufficient Session Expiration) with a CVSS v3.1 base score of 4.9 (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N), indicating network accessibility, low attack complexity, and high-privilege requirements but primarily impacting integrity.
Exploitation requires high privileges (PR:H), targeting authenticated users with administrative or elevated roles whose accounts are subsequently disabled. An attacker with such an account could maintain unauthorized access to Kiteworks resources post-disablement, potentially performing integrity-modifying actions like altering data or configurations until session timeouts occur, without needing user interaction or affecting confidentiality or availability.
The Kiteworks security advisory recommends upgrading to version 9.2.1 or later, where the patch addresses the session invalidation issue upon account disablement. Additional details are available in the GitHub Security Advisory at https://github.com/kiteworks/security-advisories/security/advisories/GHSA-92w7-fpjr-wpxc.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-15807
Vulnerability Data
Kiteworks is a private data network (PDN). Prior to version 9.2.1, a vulnerability in Kiteworks Email Protection Gateway session management allows blocked users to maintain active sessions after their account is disabled. This could allow unauthorized access to continue until…
more
the session naturally expires. Upgrade Kiteworks to version 9.2.1 or later to receive a patch.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
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.
Credential lifecycle management directly includes enforcing session expiration to prevent reuse.
Authorization policy enforcement and review covers terminating stale sessions to limit access scope.
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.
Automatic termination of inactive sessions and limits on connection duration shrink the window during which a hijacked or unattended authenticated session can be exploited.