CVE-2026-84652

High

Description

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Jenkins does not rotate the session when a user is authenticated via the "remember me" cookie, allowing attackers able to serve content on the same site as Jenkins to set a known session cookie in the victim's browser, which after the victim authenticates via the "remember me" cookie, grants the attacker access to Jenkins as that user.

SeverityHigh

CVSS7.3

Exploit probability—

Product

Jenkins

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-384CWE-384

How to fix

Update

jenkins jenkins2.568.3, 2.580 or later

Vendor advisories

jenkins.io/security/advisory/2026-09-02/#SECURITY-4016

Affected products

Product	Affected versions	Fixed in
jenkins jenkins	v < 2.568.3, v < 2.580	2.568.3, 2.580

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