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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2025-12799] Jastow Cross-Site Scripting attack due to unsanitized URI

This medium-severity Red Hat Linux advisory covers CVE-2025-12799 affecting Red Hat JBoss Enterprise Application Platform 8.1.7.GA, Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10, Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-12799 Source published Source updated

VulniPulse record published Record updated

CVE-2025-12799
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

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. Exploitation requires a specific, non-default configuration, limiting its applicability in typical deployments.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N). Weakness: CWE-79.

Affected Red Hat products: Red Hat JBoss Enterprise Application Platform 8.1.7.GA; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9; Red Hat JBoss Enterprise Application Platform 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7.

Red Hat fixing advisory: RHSA-2026:36345, RHSA-2026:36344, RHSA-2026:36342, RHSA-2026:36343.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Fixed versions
  • io.undertow.jastow/jastow:2.2.9.SP1-redhat-00001
  • eap8-0:1-9.el10eap
  • eap8-activemq-artemis-0:2.40.0-7.redhat_00015.1.el10eap
  • eap8-activemq-artemis-native-1:2.0.0-2.redhat_00005.1.el10eap
  • eap8-aesh-extensions-0:1.8.0-2.redhat_00001.1.el10eap
  • eap8-aesh-readline-0:2.4.0-1.redhat_00002.1.el10eap
  • eap8-agroal-0:2.3.0-1.redhat_00001.1.el10eap
  • eap8-angus-0:2.0.5-1.redhat_00001.1.el10eap
  • eap8-angus-activation-0:2.0.3-1.redhat_00001.1.el10eap
  • eap8-antlr4-0:4.13.2-1.redhat_00001.1.el10eap
  • eap8-apache-commons-beanutils-0:1.11.0-1.redhat_00001.1.el10eap
  • eap8-apache-commons-cli-0:1.9.0-1.redhat_00001.1.el10eap
  • eap8-apache-commons-codec-0:1.17.2-1.redhat_00001.1.el10eap
  • eap8-apache-commons-collections-0:3.2.2-28.redhat_2.1.el10eap
  • eap8-apache-commons-io-0:2.16.1-2.redhat_00002.1.el10eap
  • eap8-apache-commons-lang-0:3.18.0-2.redhat_00003.1.el10eap
  • eap8-apache-cxf-0:4.0.10-3.redhat_00001.1.el10eap
  • eap8-apache-cxf-xjc-utils-0:4.1.0-1.redhat_00001.1.el10eap
  • eap8-apache-mime4j-0:0.8.12-1.redhat_00001.1.el10eap
  • eap8-apache-sshd-0:2.14.0-4.redhat_00003.1.el10eap
  • eap8-artemis-native-1:2.0.0-2.redhat_00005.1.el10eap
  • eap8-artemis-wildfly-integration-0:2.0.4-1.Final_redhat_00001.1.el10eap
  • eap8-asyncutil-0:0.1.0-2.redhat_00010.1.el10eap
  • eap8-atinject-0:2.0.1-5.redhat_00007.1.el10eap
  • eap8-aws-java-sdk-0:2.30.32-3.redhat_00003.1.el10eap
  • eap8-azure-storage-0:8.6.6-5.redhat_00001.1.el10eap
  • eap8-bouncycastle-0:1.84.0-1.redhat_00001.1.el10eap
  • eap8-byte-buddy-0:1.14.18-2.redhat_00001.1.el10eap
  • eap8-caffeine-0:3.1.8-2.redhat_00002.1.el10eap
  • eap8-commons-logging-jboss-logging-0:1.0.0-2.Final_redhat_1.1.el10eap
  • eap8-cryptacular-0:1.2.5-2.redhat_00001.1.el10eap
  • eap8-eap-product-conf-parent-0:801.7.0-1.GA_redhat_00001.1.el10eap
  • eap8-ecj-1:3.33.0-1.redhat_00001.1.el10eap
  • eap8-eclipse-jgit-0:6.10.1.202505221210-1.r_redhat_00002.1.el10eap
  • eap8-elasticsearch-0:8.15.4-4.redhat_00003.1.el10eap
  • eap8-elytron-web-0:4.1.2-1.Final_redhat_00001.1.el10eap
  • eap8-eventstream-0:1.0.1-3.redhat_00003.1.el10eap
  • eap8-expressly-0:5.0.0-6.redhat_00001.1.el10eap
  • eap8-fastinfoset-0:2.1.1-1.redhat_00001.1.el10eap
  • eap8-fge-btf-0:1.2.0-4.redhat_00007.1.el10eap
  • RHSA-2026:36345
  • RHSA-2026:36344
  • RHSA-2026:36342
  • RHSA-2026:36343

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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: * Undertow was configured with UndertowOptions.ALLOW_UNESCAPED_CHARACTERS_IN_URL set to 'true' value * DeploymentInfo configured with setEscapeErrorMessage(true) method was passed to Undertow's Servlet Container instance

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

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