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🛡️ CVE-2026-25854 — tomcat

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-601 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Apache Tomcat has an Open Redirect vulnerability

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Attack requirements: None — no deployment-specific condition has to hold.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-25854 is classified as CWE-601: Open Redirect. A redirect target is taken from user input, so a trusted link can send the visitor to an attacker's site.

Affected software

CVE-2026-25854 is recorded against 4 packages.

  • org.apache.tomcat.embed:tomcat-embed-core (from 11.0.0-M1 up to 11.0.20)
  • org.apache.tomcat:tomcat (from 11.0.0-M1 up to 11.0.20)
  • org.apache.tomcat:tomcat-catalina (from 11.0.0-M1 up to 11.0.20)
  • tomcat

Timeline and source

Published on 9 April 2026 and last revised on 16 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Package)
lists.apache.org (Web)
www.openwall.com (Web)

Other advisories for this package

org.apache.tomcat:tomcat has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-601: Open Redirect) in other software:

CVE-2026-25854 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
CWE CWE-601
Public Exploit ✅ No
Source OSV
Published 2026-04-09
Updated 2026-08-20
Modified 2026-04-16
Fix URL N/A

Affected Packages

Software From version Fixed in
org.apache.tomcat:tomcat 11.0.0-M1 11.0.20
org.apache.tomcat:tomcat-catalina 11.0.0-M1 11.0.20
org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M1 11.0.20
tomcat — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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