Cyber Resilience

CVE-2026-25854

Open Redirect in Apache Tomcat 9.0.1 – 9.0.116

Open Redirect
Published
09 April 2026
Modified
14 April 2026
Patch / advisory
View advisory
CVSS Score v3.1 6.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS Score 0.0053 41th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-25854 is a medium-severity Open Redirect (CWE-601) vulnerability in Apache Tomcat. Its CVSS base score is 6.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 41th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and SI-2 (Flaw Remediation) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

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…

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also be affected Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

CWE(s)
CWE-601

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Open redirect in public-facing Tomcat enables exploitation of Internet-facing apps for initial access.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-55754Same product: Apache Tomcat
CVE-2026-53404Same product: Apache Tomcat
CVE-2026-34483Same product: Apache Tomcat
CVE-2026-43515Same product: Apache Tomcat
CVE-2026-55957Same product: Apache Tomcat
CVE-2025-66614Same product: Apache Tomcat
CVE-2026-34486Same product: Apache Tomcat
CVE-2026-55956Same product: Apache Tomcat
CVE-2026-32990Same product: Apache Tomcat
CVE-2026-29146Same product: Apache Tomcat

Affected Assets

apache
tomcat
9.0.0 · 9.0.1 — 9.0.116 · 10.1.0 — 10.1.53 · 11.0.0 — 11.0.20

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-2 Flaw Remediation
  • SI-10 Information Input Validation
  • SI-15 Information Output Filtering
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.7.2

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly addresses the CVE by requiring prompt application of the vendor-supplied patches that eliminate the flawed LoadBalancerDrainingValve redirect logic.

SI-10 Information Input Validation good match
prevent

Validates the user-supplied redirect target against an allow-list before the valve performs the HTTP redirect, blocking the open-redirect vector.

SI-15 Information Output Filtering partial match
prevent

Filters or sanitizes outbound redirect Location headers so that only trusted destinations are ever emitted by the application.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and untrusted-redirect controls that prevent CWE-601.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.23 Web filtering partial match
mitigates

Preventing access to attacker-controlled or malicious sites stops users from being redirected to untrusted locations via open-redirect or phishing links.

References