# CVE-2026-75973: tomcat9: Improper Authentication vulnerability in Apache Tomcat CVE-2026-75973 is fixed in 27 products on 1 platform, first by DEBIAN-CVE-2026-75973, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-75973 - Priority: High - CVSS: 7.3 (high) - EPSS: 0.0052 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 23, 2026 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libtcnative-1-0 opensuse-leap 16.0 | 1.3.9-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | libtcnative-1-0 sles 15.6 | 1.3.9-150600.16.9.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | libtcnative-1-0 sles 15.7 | 1.3.9-150600.16.9.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | libtcnative-1-0 sles 16.0 | 1.3.9-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | libtcnative-2-0 opensuse-leap 16.0 | 2.0.16-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | libtcnative-2-0 sles 16.0 | 2.0.16-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat opensuse-leap 16.0 | 9.0.122-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat sles 15.6 | 9.0.122-150200.123.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat sles 15.7 | 9.0.122-150200.123.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat sles 16.0 | 9.0.122-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat10 Debian 14 | 10.1.60-1 | [DEBIAN-CVE-2026-75973](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75973.md) | Sep 24, 2026 | | Linux | tomcat10 amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10 opensuse-leap 16.0 | 10.1.60-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat10 sles 15.6 | 10.1.60-150200.5.82.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat10 sles 15.7 | 10.1.60-150200.5.82.2 | [SUSE-SU-2026:4546-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4546-1.md) | Oct 6, 2026 | | Linux | tomcat10 sles 16.0 | 10.1.60-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat10-admin-webapps amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-docs-webapp amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-el-5.0-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-jsp-3.1-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-lib amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-servlet-6.0-api amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat10-webapps amzn 2023 | 1:10.1.60-1.amzn2023.0.1 | [ALAS2023-2026-3165](https://patchblox.com/security/data/fix/linux/alas2023-2026-3165.md) | Nov 7, 2026 | | Linux | tomcat11 amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11 opensuse-leap 16.0 | 11.0.26-160000.1.1 | [OPENSUSE-SU-2026:21984-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21984-1.md) | Sep 30, 2026 | | Linux | tomcat11 sles 15.6 | 11.0.26-150600.13.36.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | tomcat11 sles 15.7 | 11.0.26-150600.13.36.2 | [SUSE-SU-2026:4544-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4544-1.md) | Oct 6, 2026 | | Linux | tomcat11 sles 16.0 | 11.0.26-160000.1.1 | [SUSE-SU-2026:23985-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23985-1.md) | Sep 30, 2026 | | Linux | tomcat11-admin-webapps amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-docs-webapp amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-el-6.0-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-jsp-4.0-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-lib amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-servlet-6.1-api amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat11-webapps amzn 2023 | 1:11.0.26-1.amzn2023.0.1 | [ALAS2023-2026-3151](https://patchblox.com/security/data/fix/linux/alas2023-2026-3151.md) | Nov 7, 2026 | | Linux | tomcat9 Debian 12.15 (bookworm) | 9.0.70-2 | [DEBIAN-CVE-2026-75973](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75973.md) | Sep 24, 2026 | | Linux | tomcat9 Debian 13.5 (trixie) | 9.0.70-2 | [DEBIAN-CVE-2026-75973](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75973.md) | Sep 24, 2026 | | Linux | tomcat9 Debian 14 | 9.0.70-2 | [DEBIAN-CVE-2026-75973](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75973.md) | Sep 24, 2026 | | Linux | tomcat9 amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-admin-webapps amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-docs-webapp amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-el-3.0-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-jsp-2.3-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-lib amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-servlet-4.0-api amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | | Linux | tomcat9-webapps amzn 2023 | 1:9.0.122-1.amzn2023.0.1 | [ALAS2023-2026-3166](https://patchblox.com/security/data/fix/linux/alas2023-2026-3166.md) | Nov 7, 2026 | --- Data as of 2026-11-08T06:59:42Z UTC. 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