Vulnerability · CVE-2026-42498
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat.
Published May 12, 2026 · catalog updated Jun 17, 2026 · Exposure of HTTP Authentication
Check if you run it
No confirmed exploitation is on record for CVE-2026-42498. EPSS is 0.65%. Act only if a listed version of Exposure of HTTP Authentication is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Exposure of HTTP Authentication).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.65%
- Remediation
- Advisory link
- Affected products
- cpe apache/tomcat
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe apache/tomcatversion unspecified
How to fix CVE-2026-42498
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-42498. EPSS is 0.65%. Act only if a listed version of Exposure of HTTP Authentication is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-200: Exposure of Sensitive Information. EPSS 0.65%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jun 17, 2026 · NIST NVD
Updated
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, which fix the issue.
Oct 15, 2026 · Apache Software Foundation
Detected
Named on the public Apache Software Foundation page.
Sources
- Apache Software FoundationVendor advisoryCVE-2026-42498
CVE-2026-42498 is named on the public Apache Software Foundation page.
tomcat.apache.org - CVE.orgVulnerability recordCVE-2026-42498
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-42498
30-day exploitation probability 0.6%
first.org - NIST NVDVulnerability recordCVE-2026-42498
Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, f
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.