Vulnerability in Graylog
CVE-2026-1435
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Graylog — versions 2.2.3
- Graylog Web Interface — versions 2.2.3
Weakness classification (CWE)
References
- www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-graylog (Third Party Advisory, patch)
Frequently asked questions
- What is CVE-2026-1435?
- CVE-2026-1435 is a critical-severity vulnerability in Graylog, classified under Insufficient Session Expiration. CVSS score: 9.8/10. Published 2026-02-18.
- How severe is CVE-2026-1435?
- Critical severity. CVSS v3 base score is 9.8 out of 10.