RHSA-2026:36345

Vulnerability from csaf_redhat - Published: 2026-07-07 18:00 - Updated: 2026-07-08 00:00
Summary
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.7 security update
Severity
Moderate
Notes
Topic: A security update is now available for Red Hat JBoss Enterprise Application Platform 8.1. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat JBoss Enterprise Application Platform 8 is a platform for Java applications based on the WildFly application runtime. This release of Red Hat JBoss Enterprise Application Platform 8.1.7 serves as a replacement for Red Hat JBoss Enterprise Application Platform 8.1.6, and includes bug fixes and enhancements. See the Red Hat JBoss Enterprise Application Platform 8.1.7 Release Notes for information about the most significant bug fixes and enhancements included in this release. Security Fix(es): * io.undertow.jastow-jastow: Jastow Cross-Site Scripting attack due to unsanitized URI (CVE-2025-12799) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2025-12799

A flaw was found in Jastow. Jastow is vulnerable to Cross-Site Scripting (XSS) attack. If using a set of combined configuration to allow unescaped characters in URL with embedded Undertow and Jastow, a server might be vulnerable to improper input handling.

6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Red Hat JBoss Enterprise Application Platform 8.1
Red Hat / Red Hat JBoss Enterprise Application Platform
 cpe:/a:redhat:jboss_enterprise_application_platform:8.1::el9 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
References
To clipboard 

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          "text": "A flaw was found in Jastow. Jastow is vulnerable to Cross-Site Scripting (XSS) attack. If using a set of combined configuration to allow unescaped characters in URL with embedded Undertow and Jastow, a server might be vulnerable to improper input handling.",
          "title": "Vulnerability description"
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          "text": "This Moderate impact Cross-Site Scripting (XSS) flaw in Jastow, as used in Red Hat Enterprise Application Platform, arises when a server is configured to allow unescaped characters in URLs with embedded Undertow. Exploitation requires a specific, non-default configuration, limiting its applicability in typical deployments.",
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          "details": "Before applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258",
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          "details": "It is possible to contruct successful attack vector if and only if customer or client is using embedded Undertow and Jastow together in their application and the following conditions are met:\n * Undertow was configured with UndertowOptions.ALLOW_UNESCAPED_CHARACTERS_IN_URL set to \u0027true\u0027 value\n * DeploymentInfo configured with setEscapeErrorMessage(true) method was passed to Undertow\u0027s Servlet Container instance",
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      "title": "jastow: Jastow Cross-Site Scripting attack due to unsanitized URI"
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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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