CVE-2026-49091

Description

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.

CVSS v3.1 Score

8.0

HIGH

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

EPSS — Exploit Prediction

0.0020

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-116 CWE-116

Affected Products

Vendor	Product	Versions
elastic	kibana	7.0.0 — 7.17.15
elastic	kibana	8.0.0 — 8.11.1

References

Advisories & Patches

https://discuss.elastic.co/t/kibana-7-17-15-8-11-1-security-update-esa-2026-53

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 8.0 (HIGH).

How severe is CVE-2026-49091? +

CVE-2026-49091 has a CVSS v3.1 score of 8.0 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0020, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-49091? +

CVE-2026-49091 affects products from elastic, specifically: kibana. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-49091? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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