CVE-2026-25854

MEDIUM

Apache Tomcat: Occasionally open redirect

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2026-25854. PoCs published by gregk4sec.

AI-analyzed exploit summary The repository contains a functional PoC for CVE-2026-25854, an open redirect vulnerability in Apache Tomcat's LoadBalancerDrainingValve. The exploit leverages a crafted URI with leading slashes to trigger a cross-system redirect, potentially affecting SSO/OIDC flows or payment systems.

Description

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

Exploits (1)

nomisec WORKING POC
by gregk4sec · poc
https://github.com/gregk4sec/cve-2026-25854

The repository contains a functional PoC for CVE-2026-25854, an open redirect vulnerability in Apache Tomcat's LoadBalancerDrainingValve. The exploit leverages a crafted URI with leading slashes to trigger a cross-system redirect, potentially affecting SSO/OIDC flows or payment systems.

Classification
Working Poc 95%
Attack Type
Other
Complexity
Trivial
Reliability
Reliable
Target: Apache Tomcat 11.0.x / 10.1.x / 9.x
No auth needed
Prerequisites: Tomcat node in a cluster with LoadBalancerDrainingValve in disabled (draining) state
devstral-2 · analyzed Apr 12, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 6.1
EPSS 0.0003
EPSS Percentile 10.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-601
Status published
Products (10)
apache/tomcat 9.0.0 milestone23 (5 CPE variants)
apache/tomcat 9.0.1 - 9.0.116
Apache Software Foundation/Apache Tomcat < 7.0.109
Apache Software Foundation/Apache Tomcat 10.1.0-M1 - 10.1.52
Apache Software Foundation/Apache Tomcat 11.0.0-M1 - 11.0.18
Apache Software Foundation/Apache Tomcat 8.5.30 - 8.5.100
Apache Software Foundation/Apache Tomcat 9.0.0.M23 - 9.0.115
org.apache.tomcat/tomcat 8.5.30 - 9.0.116Maven
org.apache.tomcat/tomcat-catalina 8.5.30 - 9.0.116Maven
org.apache.tomcat.embed/tomcat-embed-core 8.5.30 - 9.0.116Maven
Published Apr 09, 2026
Tracked Since Apr 10, 2026