CVE-2026-49091: Improper Output Neutralization for Logs (CWE-117) in Kibana can lead to log injection via Log Injection-Tamper

Routine

HIGH 8.0UPGRADE

CVE-2026-49091 is a high-severity flaw (CVSS 8.0) affecting kibana. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.0 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-116
Published	2026-07-01
Last modified	2026-10-25

Publisher (CNA): Elastic · Vendor: elastic

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-01 18:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

elastic kibana UPGRADE

Affected: >= 7.0.0 and < 7.17.15 · >= 8.0.0 and < 8.11.1

Fixed in: 7.17.15, 8.11.1

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy kibana || rpm -q kibana || kibana --version

2. UPGRADE to 7.17.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kibana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kibana

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison kibana sudo apt install kibana=<VERSION_BEFORE_7.0.0> sudo apt-mark hold kibana

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list kibana sudo dnf downgrade kibana-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add kibana

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49091?

kibana: upgrade to 7.17.15, 8.11.1. Exact commands for each OS are on this page.

Is CVE-2026-49091 being exploited?

CVE-2026-49091 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49091 affect?

CVE-2026-49091 affects kibana. Severity is high (CVSS 8.0). 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.

How urgent is CVE-2026-49091?

Priority 34/100. High severity

Software pages

Kibana vulnerabilities

Related CVEs

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CVE-2026-49088 MEDIUM 4.4 UPGRADE Insertion of Sensitive Information into Log File (CWE-532) in Kibana can lead to information disclosure
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References

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