Detections
Analytics
Apache Tomcat 9.0.0.M1 < 9.0.121 multiple vulnerabilities
medium Nessus Plugin ID 330442
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Synopsis
The remote Apache Tomcat server is affected by multiple vulnerabilitiesDescription
The version of Tomcat installed on the remote host is prior to 9.0.121. It is, therefore, affected by multiple vulnerabilities as referenced in the fixed_in_apache_tomcat_9.0.121_security-9 advisory.- Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue. (CVE-2026-66299)
- Insufficient Session Expiration vulnerability in Apache Tomcat meant that if the session ID for an authenticated HTTP session was changed after a WebSocket connection had been established under that authenticated HTTP session, the WebSokcet session would not be closed as required by the Jakarta WebSocket specification when the HTTP session ended. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue. (CVE-2026-73180)
- Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue. (CVE-2026-68763)
- Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPNEGO) that a user would be authenticated even if the user did not exist in the DataSourceRealm. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
(CVE-2026-68569)
- Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a security constraint that limits user has access to a resource POST but not GET. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected:
from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fixes the issue.
(CVE-2026-68525)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Apache Tomcat version 9.0.121 or later.See Also
http://www.nessus.org/u?0c2f0c5f
http://www.nessus.org/u?35ee92d8
http://www.nessus.org/u?48ca02d1
http://www.nessus.org/u?5ff1419a
http://www.nessus.org/u?992cceaa
http://www.nessus.org/u?b9a15269
http://www.nessus.org/u?c64984d6
http://www.nessus.org/u?cfe1050c
http://www.nessus.org/u?d0d0b337
http://www.nessus.org/u?d1274f40
http://www.nessus.org/u?dcb4ee25
http://www.nessus.org/u?e52ff8fc
Plugin Details
Severity: Medium
ID: 330442
File Name: tomcat_9_0_121.nasl
Version: 1.6
Type: Combined
Agent: windows, macosx, unix
Family: Web Servers
Published: 7/28/2026
Updated: 8/31/2026
Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.3
Percentile: 96.43
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2026-66299
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:apache:tomcat:9
Required KB Items: installed_sw/Apache Tomcat
Exploit Ease: No known exploits are available
Patch Publication Date: 8/18/2026
Vulnerability Publication Date: 7/28/2026
Reference Information
CVE: CVE-2026-65182, CVE-2026-65183, CVE-2026-65637, CVE-2026-65905, CVE-2026-65927, CVE-2026-66299, CVE-2026-66422, CVE-2026-68525, CVE-2026-68569, CVE-2026-68763, CVE-2026-73180
IAVA: 2026-A-0902