Security readout for executives and security teams
Plain-English summary
CVE-2026-23919 is a Zabbix Server/Proxy data isolation issue in reused JavaScript execution contexts. A non-super Zabbix administrator may be able to leak data from hosts they should not access. This is primarily a confidentiality concern for organizations that delegate Zabbix administration across teams or tenants.
Executive priority
Prioritize remediation if Zabbix is used for shared administration, managed services, or segmented business units. The main business risk is unauthorized visibility into monitoring data across host boundaries. If Zabbix is centrally administered only by trusted super administrators, urgency may be lower but upgrade planning is still recommended.
Technical view
Zabbix reuses Duktape JavaScript contexts for script items, JavaScript preprocessing, and webhooks. Insufficient isolation can expose data across contexts. The CVSS v4.0 score is 7.1 High, with high privileges required and no user interaction. Zabbix states a fix makes built-in JavaScript objects read-only and warns against global JavaScript variables.
Likely exposure
Exposure is most relevant where Zabbix Server or Proxy uses JavaScript-based items, preprocessing, or webhooks, and non-super administrators have delegated access. Listed affected product versions include Zabbix 6.0.0, 7.0.0, 7.2.0, and 7.4.0, with default status unknown in the CVE data.
Exploitation context
The source bundle does not show public exploitation or CISA KEV listing. Exploitation requires authenticated high-privilege Zabbix access, described as a regular non-super administrator, and specific JavaScript usage conditions. The issue can cross intended host access boundaries inside Zabbix.
Researcher notes
Evidence is limited to CVE metadata and the Zabbix issue reference. The CVE identifies CWE-488 and a CVSS v4 vector indicating adjacent attack vector, low complexity, high privileges, and partial integrity and availability impacts. No exploit details, proof of concept, or confirmed in-the-wild activity are present in the provided sources.
Mitigation direction
- Review Zabbix advisory ZBX-27638 for fixed versions and upgrade guidance.
- Apply the released Zabbix fix when available for your deployment branch.
- Avoid using global JavaScript variables in Zabbix preprocessing, scripts, and webhooks.
- Restrict non-super administrator rights to the minimum operational scope.
- Review delegated Zabbix administration models for cross-team or tenant exposure.
Validation and detection
- Inventory Zabbix Server and Proxy versions across environments.
- Identify use of script items, JavaScript preprocessing, and webhooks.
- Check whether non-super administrators can manage affected JavaScript features.
- Review configurations for global JavaScript variable usage.
- Confirm vendor-fixed builds are deployed after Zabbix guidance is reviewed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-488: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-23919 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
Source materials
- CVE List V5 sourceCVE List V5
- https://support.zabbix.com/browse/ZBX-27638CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Data Element to Wrong Session
Exposure of Data Element to Wrong Session represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.