# CVE-2026-1435

## Summary

- **CVE ID:** CVE-2026-1435
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-613
- **Published:** Feb 18, 2026
- **Last Modified:** Mar 12, 2026

## Description

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.

## Affected Products

- Graylog — Graylog Web Interface (2.2.3)

## References

- [CNA](https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-graylog)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.37%
- **EPSS Percentile:** 30.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._