What is the CVSS score of CVE-2026-1435?

CVE-2026-1435 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Graylog are affected by CVE-2026-1435?

A critical session management vulnerability in Graylog 2.2.3 allows attackers to maintain unauthorized access to the web interface even after user logout, potentially enabling persistent unauthorized…

How to fix or mitigate CVE-2026-1435?

Within 24 hours: Immediately inventory all Graylog deployments and confirm version 2.2.3 usage; restrict Graylog web interface access to trusted networks only via firewall/VPN. Within 7 days: Implement mandatory session timeout policies (15-30 minutes max) and force password resets for all Graylog users; enable enhanced logging and monitoring for session anomalies. Within 30 days: Upgrade to patched Graylog version when available; conduct forensic review of access logs for evidence of session hijacking or unauthorized access.

Graylog CVE-2026-1435

CRITICAL

Insufficient Session Expiration (CWE-613)

2026-02-18 cve-coordination@incibe.es

Authentication Bypass Graylog

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 18, 2026 - 14:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Not properly invalidated session vulnerability in Graylog Web Interface, version 2.2.3, due to incorrect management of session invalidation after new logins. The application generates a new 'sessionId' each time a user authenticates, but does not invalidate previously issued session identifiers, which remain valid even after multiple consecutive logins by the same user. As a result, a stolen or leaked 'sessionId' can continue to be used to authenticate valid requests. Exploiting this vulnerability would allow an attacker with access to the web service/API network (port 9000 or HTTP/S endpoint of the server) to reuse an old session token to gain unauthorized access to the application, interact with the API/web, and compromise the integrity of the affected account.

AnalysisAI

Improper session invalidation in Graylog Web Interface 2.2.3 allows attackers to maintain access through expired sessions, potentially enabling persistent unauthorized access to log management systems.