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CVE-2026-66422— Apache Tomcat: Servlet role references can bypass declarative role constraints

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.0-M1至11.0.24版本、10.1.0-M1至10.1.57版本、9.0.25至9.0.120版本、8.5.46至8.5.100版本和7.0.97至7.0.109版本存在授权问题漏洞，该漏洞源于security-role-ref定义被错误地用作Realm中的角色别名，并结合Request.isUserInRole()的错误使用，导致授权不当。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 6

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.24 affected
10.1.0-M1≤ 10.1.57 affected
9.0.25≤ 9.0.120 affected
8.5.46≤ 8.5.100 affected
7.0.97≤ 7.0.109 affected
< 7.0.97 unaffected
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I. Basic Information for CVE-2026-66422

Vulnerability Information
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Vulnerability Title
Apache Tomcat: Servlet role references can bypass declarative role constraints
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as role aliases within the Realm in additional to the correct usage with Request.isUserInRole(). This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.25 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.46 through 8.5.100, from 7.0.97 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.0-M1至11.0.24版本、10.1.0-M1至10.1.57版本、9.0.25至9.0.120版本、8.5.46至8.5.100版本和7.0.97至7.0.109版本存在授权问题漏洞，该漏洞源于security-role-ref定义被错误地用作Realm中的角色别名，并结合Request.isUserInRole()的错误使用，导致授权不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.24 -

II. Public POCs for CVE-2026-66422

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III. Intelligence Information for CVE-2026-66422

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Mailing List Discussions for CVE-2026-66422 (1)

Same Patch Batch · Apache Software Foundation · 2026-08-25 · 14 CVEs total

CVE-2026-49050 Apache DolphinScheduler: General user can mint admin access tokens via /access-tokens
CVE-2026-53561 Apache Hive: Unauthenticated authentication bypass in HiveServer2 HTTP SAML bearer-token v
CVE-2026-55976 Apache Hive: SSRF vulnerability in Hive Avro Serde due to Insufficient input validation on
CVE-2026-49845 Apache Hive: SQL Injection vulnerability in HiveMetaStore partition-name direct-SQL paths
CVE-2026-65182 Apache Tomcat: Bypass longest prefix security constraint
CVE-2026-65183 Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets
CVE-2026-65637 Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix in
CVE-2026-65905 Apache Tomcat: Limited replay attack possible with DIGEST authentication
CVE-2026-65927 Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
CVE-2026-68525 Apache Tomcat: Redirect after FORM auth may bypass method specific constraints
CVE-2026-68569 Apache Tomcat: Principal lookup can fail open in some cases
CVE-2026-68763 Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset
CVE-2026-73180 Apache Tomcat: Authenticated WebSocket session survives end of HTTP session

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-285

V. Comments for CVE-2026-66422

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