How severe is CVE-2026-1436?

CVE-2026-1436 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-1436 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1436?

CVE-2026-1436 affects Graylog. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-1436?

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

Does CVE-2026-1436 have an EU (EUVD) identifier?

Yes. CVE-2026-1436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8076.

When was CVE-2026-1436 published?

CVE-2026-1436 was published on 2026-02-18 and last updated on 2026-06-17.

CVE-2026-1436

CVE-2026-1436 is a medium-severity vulnerability in Graylog with a CVSS 3.x base score of 6.5. 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8076
Weakness: CWE-639
Affected product: Graylog
Published: 2026-02-18
Last modified: 2026-06-17

Description

Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in the URL. An authenticated user can access other user's profiles without proper authorization checks. Exploiting this vulnerability allows valid users of the system to be listed and sensitive third-party information to be accessed, such as names, email addresses, internal identifiers, and last activity. The endpoint 'http://<IP>:12900/users/<my_user>' does not implement object-level authorization validations.

Frequently asked questions

What is CVE-2026-1436?: Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in the URL. An authenticated user can access other user's profiles without proper authorization checks. Exploiting this vulnerability allows valid users of the system to be listed and sensitive third-party information to be accessed, such as names, email addresses, internal identifiers, and last activity. The endpoint 'http://<IP>:12900/users/<my_user>' does not implement object-level authorization validations.
How severe is CVE-2026-1436?: CVE-2026-1436 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-1436 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1436?: CVE-2026-1436 affects Graylog. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-1436?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-1436 have an EU (EUVD) identifier?: Yes. CVE-2026-1436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8076.
When was CVE-2026-1436 published?: CVE-2026-1436 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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