CVE-2025-12799 Jastow: jastow cross-site scripting attack due to unsanitized uri
Medium 6.5
Published
Updated
Check this codebase for CVE-2025-12799 and fix it if it is affected.
What it is: CVE-2025-12799 is a medium-severity cross-site scripting vulnerability in Red Hat JBoss Enterprise Application Platform 7, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-12799 in the wild and no public exploit code.
Affected product: Red Hat JBoss Enterprise Application Platform 7. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2025-12799/ (Markdown: https://insights.sbomify.com/CVE-2025-12799/index.md)
Attackers can execute arbitrary scripts in user browsers via unsanitized URIs in JBoss EAP when specific combined configurations are enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-12799?
CVE-2025-12799 is a medium-severity cross-site scripting vulnerability in Red Hat JBoss Enterprise Application Platform 7, published on 7 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2025-12799?
Linux distribution packages (40)
eap8 Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:1-9.el10eap |
eap8-activemq-artemis Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-cli Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-commons Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-core-client Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-dto Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-hornetq-protocol Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-hqclient-protocol Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-jakarta-client Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-jakarta-ra Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-jakarta-server Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-jakarta-service-extensions Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-jdbc-store Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-journal Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-native Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 1:2.0.0-2.redhat_00005.1.el10eap |
eap8-activemq-artemis-selector Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-activemq-artemis-server Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.40.0-7.redhat_00015.1.el10eap |
eap8-aesh-extensions Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:1.8.0-2.redhat_00001.1.el10eap |
eap8-aesh-readline Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.4.0-1.redhat_00002.1.el10eap |
eap8-agroal Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.3.0-1.redhat_00001.1.el10eap |
eap8-agroal-api Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.3.0-1.redhat_00001.1.el10eap |
eap8-agroal-narayana Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.3.0-1.redhat_00001.1.el10eap |
eap8-agroal-pool Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.3.0-1.redhat_00001.1.el10eap |
eap8-angus Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.0.5-1.redhat_00001.1.el10eap |
eap8-angus-activation Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.0.3-1.redhat_00001.1.el10eap |
eap8-angus-mail Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.0.5-1.redhat_00001.1.el10eap |
eap8-antlr4 Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.13.2-1.redhat_00001.1.el10eap |
eap8-antlr4-runtime Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.13.2-1.redhat_00001.1.el10eap |
eap8-apache-commons-beanutils Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:1.11.0-1.redhat_00001.1.el10eap |
eap8-apache-commons-cli Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:1.9.0-1.redhat_00001.1.el10eap |
eap8-apache-commons-codec Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:1.17.2-1.redhat_00001.1.el10eap |
eap8-apache-commons-collections Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:3.2.2-28.redhat_2.1.el10eap |
eap8-apache-commons-io Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:2.16.1-2.redhat_00002.1.el10eap |
eap8-apache-commons-lang Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:3.18.0-2.redhat_00003.1.el10eap |
eap8-apache-cxf Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.0.10-3.redhat_00001.1.el10eap |
eap8-apache-cxf-rt Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.0.10-3.redhat_00001.1.el10eap |
eap8-apache-cxf-services Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.0.10-3.redhat_00001.1.el10eap |
eap8-apache-cxf-tools Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.0.10-3.redhat_00001.1.el10eap |
eap8-apache-cxf-xjc-utils Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:4.1.0-1.redhat_00001.1.el10eap |
eap8-apache-mime4j Red Hat:jboss_enterprise_application_platform:8.1::el10 | All versions | 0:0.8.12-1.redhat_00001.1.el10eap |
How do I fix CVE-2025-12799?
Apply the vendor's patch.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-12799 being exploited?
There is no known exploitation of CVE-2025-12799 in the wild and no public exploit code.
Sources
Also known as GHSA-rfhw-2486-47r9, RHSA-2026:36342, RHSA-2026:36343, RHSA-2026:36344.