CVE-2026-25854
Description
A flaw was found in Apache Tomcat. This open redirect vulnerability allows an attacker to redirect a user to an untrusted site. This occurs through the LoadBalancerDrainingValve, which can be exploited to manipulate URL redirection. The primary impact is that users may be unknowingly directed to malicious websites, potentially leading to phishing attacks or other security compromises.
Statement
This Low impact vulnerability in Apache Tomcat allows for an open redirect through the LoadBalancerDrainingValve. An attacker could exploit this to redirect users to malicious websites, potentially leading to phishing. This affects Red Hat Enterprise Linux and Red Hat JBoss Web Server when Apache Tomcat is configured with the LoadBalancerDrainingValve.
Mitigation
To mitigate this vulnerability, disable or remove the LoadBalancerDrainingValve configuration from the server.xml file in your Apache Tomcat installation. This valve is typically configured within a <Host> or <Engine> element. After modifying server.xml, restart the Apache Tomcat service for the changes to take effect. This action may impact load balancing functionality if the valve is actively used for draining connections.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.3 | N/A | 6.1 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Changed |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | None | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
The user may be redirected to an untrusted page that contains malware which may then compromise the user's system. In some cases, an open redirect can also enable the immediate download of a file without the user's permission, because the redirection to an external site may lead to endpoints on those sites that automatically trigger a download action ("drive-by download" [REF-1478]). This will expose the user to extensive risk. The user's interaction with the web server may also be compromised if the malware conducts keylogging or other attacks that steal credentials, personally identifiable information (PII), or other important data.
Access Control,Confidentiality,Other
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity; Other
By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam. The user may be subjected to phishing attacks by being redirected to an untrusted page. The phishing attack may point to an attacker controlled web page that appears to be a trusted web site. The phishers may then steal the user's credentials and then use these credentials to access the legitimate web site. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.
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