CVE-2026-1435

critical · 9.3

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.

9.3

CVSS

0.4%

EPSS (exploit prob.)

31st

EPSS percentile

2026-02-18

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-613

Affected products

Vendor	Product	Affected versions
graylog	graylog	2.2.3

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-1435