Vulnerability

CVE-2026-53440

Medium· 4.3CVSS4.3EPSS0%

.rules3/5

Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redirec

Threat signal

50/100

Elevated

Severity

medium

CVSS

4.3

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

4.3/ 10MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionRequiredRequires user action (click, file open, etc).
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactLowSome data modification; attacker doesn't fully control extent.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.03%

probability of exploitation in next 30 days

higher than 9% of all CVEs

2-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-53440. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-10Published
2026-06-12Last modified1 source

References

https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3721

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.