How severe is CVE-2026-1440?

CVE-2026-1440 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-1440 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1440?

CVE-2026-1440 affects Graylog. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-1440?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-1440 have an EU (EUVD) identifier?

Yes. CVE-2026-1440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8068.

When was CVE-2026-1440 published?

CVE-2026-1440 was published on 2026-02-18 and last updated on 2026-06-17.

CVE-2026-1440

CVE-2026-1440 is a medium-severity vulnerability in Graylog with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8068
Weakness: CWE-79
Affected product: Graylog
Published: 2026-02-18
Last modified: 2026-06-17

Description

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 execution in the victim's browser and limited manipulation of the affected user's session context, through the '/system/pipelines/' endpoint.

Frequently asked questions

What is CVE-2026-1440?: 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 execution in the victim's browser and limited manipulation of the affected user's session context, through the '/system/pipelines/' endpoint.
How severe is CVE-2026-1440?: CVE-2026-1440 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-1440 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1440?: CVE-2026-1440 affects Graylog. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-1440?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-1440 have an EU (EUVD) identifier?: Yes. CVE-2026-1440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8068.
When was CVE-2026-1440 published?: CVE-2026-1440 was published on 2026-02-18 and last updated on 2026-06-17.

References

https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-graylog

Affected products (1)

cpe:2.3:a:graylog:graylog:2.2.3:*:*:*:*:*:*:*

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