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CVE-2026-75973

Apache Tomcat: Cross-context authentication mix-up with Jakarta Authentication configured

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-75973

Published

Improper Authentication vulnerability in Apache Tomcat. When Jakarta Authentication was configured with SimpleAuthConfigProvider as the default provider and multiple web application used that provider, the realm for the first web application to authenticate a request would be used for all web applications. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M4 through 9.0.121. 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. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fixes the issue.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-75973

Published

Apache Tomcat

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Apache Software Foundation",
                    "product": "Apache Tomcat",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "11.0.0-M1",
                            "lessThanOrEqual": "11.0.25",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "10.1.0-M1",
                            "lessThanOrEqual": "10.1.59",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "9.0.0.M4",
                            "lessThanOrEqual": "9.0.121",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "8.5.0",
                            "lessThanOrEqual": "8.5.100",
                            "versionType": "semver"
                        },
                        {
                            "status": "unaffected",
                            "version": "0",
                            "lessThanOrEqual": "7.0.109",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON