VulnerabilityPublished 25 Mar 2026

CVE-2026-29092: Kiteworks Email Protection Gateway · Insufficient Session Expiration

Affects Kiteworks Email Protection GatewaySource CVE Database V5

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Not known to be exploited · CVSS 4.9 Medium : upgrade to 9.2.1 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

4.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 15% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 9.2.1

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: High
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: High: The attacker is authorized with (i.e., requires) privileges that provide significant (e.g., administrative) control over the vulnerable component that could affect component-wide settings and files.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Kiteworks Email Protection Gateway to 9.2.1.

Affected software

Product	Affected	Fixed in
kiteworksKiteworks Email Protection Gateway	Affected <9.2.1	Fixed in 9.2.1

AI-suggested

Organizations should upgrade Kiteworks Email Protection Gateway to version 9.2.1 or later immediately to ensure sessions are properly invalidated upon account disabling. Beyond patching, administrators should implement strict session timeout policies and monitor active sessions for anomalies, especially after user status changes. Employing multi-factor authentication (MFA) can reduce the risk of unauthorized session creation. Regular audits of user accounts and session states can help detect lingering active sessions of disabled users. Additionally, integrating session management with centralized identity and access management (IAM) systems can provide more immediate revocation capabilities. Logging and alerting on session activity post-account disablement should be enabled to detect potential exploitation attempts. Finally, educating security teams about this vulnerability and ensuring incident response plans include session invalidation checks will enhance overall resilience.

Description

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 the session naturally expires. Upgrade Kiteworks to version 9.2.1 or later to receive a patch.

Impact

The primary impact of this vulnerability is the potential for unauthorized access persistence after user accounts have been disabled. This can lead to unauthorized actions being performed by blocked users, potentially compromising the integrity of sensitive data and system configurations. Organizations relying on Kiteworks Email Protection Gateway for secure email handling and private data networking may face risks of insider threats or compromised accounts maintaining access longer than intended. Although confidentiality is not directly compromised, the ability to act with revoked privileges can facilitate further attacks or data manipulation. The medium CVSS score reflects the need for prior authenticated access with high privileges, limiting the scope but still posing a significant risk in environments where account disabling is used as a security control. The lack of known exploits reduces immediate urgency but does not eliminate the risk, especially in high-security or regulated industries. Failure to patch could result in compliance issues and increased exposure to insider threats or credential misuse.

CWE-613DEPRECATED: Insufficient Session Expiration (opens in a new tab)
Base weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
This entry has been deprecated because it was insufficiently clear. Consider CWE-1462 and its descendants.
MITRE does not allow mapping vulnerabilities to this entry; it groups weaknesses rather than naming one.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V2.8.1 (opens in a new tab)
V2.8.6 (opens in a new tab)
V3.6.1 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/kiteworks/security-advisories/security/advisories/GHSA-92w7-fpjr-wpxc (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Mar 2026, 17:31 UTC

WeaknessesCWE-613

Technical details

References

Community reviews

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