CVE-2026-12866 Affecting kibana-8.19-advanced package, versions <8.19.15-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-KIBANA819ADVANCED-20067940
- published24 Sept 2026
- disclosed23 Jun 2026
Introduced: 23 Jun 2026
CVE-2026-12866 (opens in a new tab)How to fix?
Upgrade Minimos:latest kibana-8.19-advanced to version 8.19.15-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kibana-8.19-advanced package and not the kibana-8.19-advanced package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
All versions of the package expr-eval are vulnerable to Code Execution via the toJSFunction() API. An attacker can execute arbitrary JavaScript by supplying crafted expressions that are compiled into native code using new Function(). Because user-controlled expressions are transformed directly into executable JavaScript, attackers can escape the intended expression sandbox and run arbitrary code within the application's context.
References
- https://www.cve.org/CVERecord?id=CVE-2026-12866
- https://github.com/advisories/GHSA-q9v2-7m5w-4693
- https://osv.dev/vulnerability/MINI-8j87-6r7x-pw3p
- https://osv.dev/vulnerability/CVE-2026-12866
- https://github.com/silentmatt/expr-eval/blob/master/src/expression.js%23L55
- https://github.com/silentmatt/expr-eval/issues/292
- https://security.snyk.io/vuln/SNYK-JS-EXPREVAL-15054690