VulnerabilityPublished 20 Jan 2026

CVE-2026-21930: Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle ZFS Storage Appliance Kit executes to compromise Oracle ZFS Storage Appliance Kit. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle ZFS Storage Appliance Kit accessible data.

Affects Oracle ZFS Storage Appliance KitSource CVE Database V5

Not known to be exploited · CVSS 2.3 Low.

Data as of 26 Oct 2026, 09:16 UTC

CVSS 3.1 base score

2.3Low

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
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: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 20 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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

Affected software

Product	Affected	Fixed in
Oracle CorporationOracle ZFS Storage Appliance Kit	Affected =8.8	Fixed in–
Mavenoracle/Oracle-ZFS-Storage-Appliance-Kit`pkg:maven/oracle/Oracle-ZFS-Storage-Appliance-Kit`Other threats	Affected =8.8	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate the risk posed by CVE-2026-21930, European organizations should implement strict access controls to limit high-privileged logon capabilities on infrastructure hosting Oracle ZFS Storage Appliance Kit. Employ role-based access control (RBAC) and enforce the principle of least privilege to minimize the number of users with elevated permissions. Monitor and audit administrative activities closely to detect unauthorized data modification attempts. Network segmentation can reduce the attack surface by isolating storage infrastructure from general user environments. Regularly review and update credentials, and consider multi-factor authentication for administrative access to increase security. Although no patches are currently available, organizations should stay informed about Oracle security advisories and apply updates promptly once released. Additionally, implementing integrity monitoring solutions on critical data can help detect unauthorized changes quickly. Conducting internal security assessments and penetration testing focused on privileged access controls will further strengthen defenses against exploitation.

Description

CVE-2026-21930 is a low-severity vulnerability affecting Oracle ZFS Storage Appliance Kit version 8.8. It allows a high-privileged attacker with existing logon access to the infrastructure hosting the appliance to perform unauthorized update, insert, or delete operations on accessible data. The vulnerability impacts data integrity but does not affect confidentiality or availability. Exploitation requires local access with high privileges and no user interaction. There are no known exploits in the wild, and no patches have been linked yet. European organizations using Oracle ZFS Storage Appliance Kit 8.8 should assess their exposure and restrict high-privileged access to mitigate risk. The vulnerability is unlikely to cause widespread disruption but could compromise data integrity in targeted attacks. Countries with significant Oracle infrastructure deployments and critical data storage needs are more likely to be affected.

Impact

For European organizations, the impact of CVE-2026-21930 is primarily on data integrity within storage environments utilizing Oracle ZFS Storage Appliance Kit version 8.8. Unauthorized modification of data can lead to corruption of critical business information, affecting operational processes and decision-making. Although the vulnerability does not expose data confidentiality or cause denial of service, the ability to alter data without authorization can undermine trust in data accuracy and compliance with data governance regulations such as GDPR. Organizations in sectors like finance, healthcare, and government, which rely heavily on data integrity, may face regulatory and reputational risks if exploited. The requirement for high privileges and local access limits the threat to insider attackers or adversaries who have already compromised administrative credentials, reducing the likelihood of widespread exploitation but increasing the risk from targeted attacks. The absence of known exploits suggests limited immediate threat, but the vulnerability should be addressed proactively to prevent potential misuse.

References

oracle.com/security-alerts/cpujan2026.html (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 28 Jan 2026, 20:19 UTC

Technical details

References

Community reviews

Related threats