CVE-2026-1437: Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused

Routine

MEDIUM 6.1DOWNGRADE

CVE-2026-1437 is a medium-severity flaw (CVSS 6.1) affecting graylog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused by a lack of proper sanitization and escaping in HTML output. Several endpoints include segments of the URL directly in the response without applying output encoding, allowing an attacker to inject and execute arbitrary JavaScript code when a user visits a specially crafted URL. Exploitation of this vulnerability may allow script executi

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-18
Last modified	2026-06-17

Publisher (CNA): Spanish National Cybersecurity Institute, S.A. (INCIBE) · Vendor: graylog

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-18 14:16 UTCPublished CVE record published
2026-06-17 10:15 UTCUpdated Record last modified

graylog graylog DOWNGRADE

Affected: 2.2.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.2.3 (Debian / Ubuntu)

apt-cache madison graylog sudo apt install graylog=<VERSION_BEFORE_2.2.3> sudo apt-mark hold graylog

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list graylog sudo dnf downgrade graylog-<VERSION_BEFORE_2.2.3> sudo dnf versionlock add graylog

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-2026-1437?

graylog: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-1437 being exploited?

CVE-2026-1437 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-2026-1437 affect?

CVE-2026-1437 affects graylog. Severity is medium (CVSS 6.1). Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused by a lack of proper sanitization and escaping in HTML output. Several endpoints include segments of the URL directly in the respo

How urgent is CVE-2026-1437?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-1441 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1440 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1439 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1438 MEDIUM 6.1 DOWNGRADE Reflected Cross-Site Scripting (XSS) vulnerability in the Graylog Web Interface console, version 2.2.3, caused
CVE-2026-1436 MEDIUM 6.5 DOWNGRADE Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in t

References

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