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Open Redirect EUVDEUVD-2026-21008

| CVE-2026-25854 MEDIUM
URL Redirection to Untrusted Site (Open Redirect) (CWE-601)
2026-04-09 apache GHSA-9m3c-qcxr-9x87
Apache Open Redirect Tomcat Red Hat Suse
6.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SUSE
MEDIUM
qualitative
Red Hat
4.3 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch released
Apr 11, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 09, 2026 - 19:45 euvd
EUVD-2026-21008
Analysis Generated
Apr 09, 2026 - 19:45 vuln.today
CVE Published
Apr 09, 2026 - 19:13 nvd
MEDIUM 6.1

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 15 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (12 direct, 3 indirect)
  • 7 maven packages depend on org.apache.tomcat:tomcat-catalina (7 direct, 0 indirect)

Ecosystem-wide dependent count for version 8.5.30 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

Open redirect vulnerability in Apache Tomcat's LoadBalancerDrainingValve allows unauthenticated remote attackers to redirect users to untrusted sites via crafted URLs. Affects Tomcat 11.0.0-M1 through 11.0.18, 10.1.0-M1 through 10.1.52, 9.0.0.M23 through 9.0.115, and 8.5.30 through 8.5.100. The vulnerability requires user interaction (clicking a malicious link) and has low real-world exploitation probability (EPSS 0.01%), with no public exploit code or confirmed active exploitation identified at the time of analysis.

Technical ContextAI

The vulnerability exists in Apache Tomcat's LoadBalancerDrainingValve component, which is a servlet valve responsible for graceful shutdown and request draining during load-balancing operations. The root cause is classified as CWE-601 (URL Redirection to Untrusted Site / Open Redirect), a client-side redirect vulnerability where user-controlled input (URL parameters) is insufficiently validated before being used in HTTP redirect responses. The LoadBalancerDrainingValve processes redirect logic during load-balancer state transitions, and fails to properly validate the target URL, allowing an attacker to inject a malicious redirect destination. This affects all supported and unsupported versions of Tomcat across multiple release branches (8.5, 9.0, 10.1, and 11.0).

RemediationAI

Upgrade to Apache Tomcat 11.0.20, 10.1.53, or 9.0.116, which contain fixes for the LoadBalancerDrainingValve open-redirect flaw. Organizations running Tomcat 8.5.x should consider upgrading to a supported release branch, as Tomcat 8.5 is no longer receiving security updates; if 8.5.x must remain in use, consult the Apache advisory for patch guidance. The fix should be applied via standard Tomcat upgrade procedures. For additional details and verification, refer to the Apache Security Advisory: https://lists.apache.org/thread/ghct3b6o74bp2vm7q875s1zh0dqrz3h0 and the NVD entry: https://nvd.nist.gov/vuln/detail/CVE-2026-25854.

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Same weakness CWE-601 – URL Redirection to Untrusted Site (Open Redirect)

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CVE-2017-1000117 HIGH POC
8.8
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8.1
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5.4
CVE-2012-0518 MEDIUM
4.7
CVE-2024-21641 MEDIUM POC
6.5
CVE-2015-5354 MEDIUM POC
5.8
CVE-2024-22891 CRITICAL POC
9.8
CVE-2022-40083 CRITICAL POC
9.6

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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EUVD-2026-21008 vulnerability details – vuln.today
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