CVE-2026-59903

This High severity Information Disclosure vulnerability was introduced in versions 9.12.1, 10.0.0, 10.1.1, 10.2.0, 10.3.0, 10.4.0, 10.5.0, 10.6.0, 10.7.1, 11.0.0, 11.1.0, 11.2.0, and 11.3.0 of Jira Software Data Center. This Information Disclosure vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has no impact to confidentiality, no impact to integrity, high impact to availability, and requires no user interaction. Atlassian recommends that Jira Software Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: * 11.3: Upgrade to a release greater than or equal to 11.3.11 * 10.3: Upgrade to a release greater than or equal to 10.3.25 * 9.12: Upgrade to a release greater than or equal to 9.12.28 See the release notes (https://www.atlassian.com/software/jira/download-archives). You can download the latest version of Jira Software Data Center from the download center (https://www.atlassian.com/software/jira/download-archives). The National Vulnerability Database provides the following description for this vulnerability: Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

EPSS 0.32% · 25.2th percentile