What is CVE-2026-49091?

CVE-2026-49091 is a high-severity vulnerability in Elastic Kibana, classified under Improper Encoding or Escaping of Output. CVSS score: 8.0/10. Published 2026-07-01.

How severe is CVE-2026-49091?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in Elastic Kibana

CVE-2026-49091

Improper Output Neutralization for Logs (CWE-117) in Kibana can lead to log injection via Log Injection-Tampering-Forging (CAPEC-93). An attacker can supply specially crafted input that is written to log files without proper neutralization. When the log files are subsequently viewed in a terminal that interprets control sequences, the injected content may alter the displayed log data.

EPSS: 0.002 (10.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Elastic Kibana — versions 8.0.0, 7.0.0

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

security@elastic.co (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-49091?: CVE-2026-49091 is a high-severity vulnerability in Elastic Kibana, classified under Improper Encoding or Escaping of Output. CVSS score: 8.0/10. Published 2026-07-01.
How severe is CVE-2026-49091?: High severity. CVSS v3 base score is 8.0 out of 10.