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  4. CVE 2025 12799 jastow jastow cross site scripting attack due to
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Back to active CVEs
Medium · CVSS 6.5CVE-2025-12799

Jastow: jastow cross-site scripting attack due to unsanitized uriCVE-2025-12799

Answer in brief

CVE-2025-12799 records a Medium severity (CVSS 6.5) vulnerability in Jastow: jastow cross-site scripting attack due to unsanitized uri. The current sources do not mark it as known exploited. The current feed maps Red Hat/eap74-els-openjdk11-openshift-rhel8/eap74-els-openjdk11-openshift-rhel8 (generic), Red Hat/eap74-els-openjdk17-openshift-rhel8/eap74-els-openjdk17-openshift-rhel8 (generic), Red Hat/eap74-els-openjdk8-openshift-rhel8/eap74-els-openjdk8-openshift-rhel8 (generic), Red Hat/io.undertow.jastow-jastow (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 7, 2026Updated Sep 29, 2026Source checked Nov 3, 2026First seen by HOL Jul 7, 2026Material review Sep 29, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
7 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/eap74-els-openjdk11-openshift-rhel8/eap74-els-openjdk11-openshift-rhel8 (generic), Red Hat/eap74-els-openjdk17-openshift-rhel8/eap74-els-openjdk17-openshift-rhel8 (generic), Red Hat/eap74-els-openjdk8-openshift-rhel8/eap74-els-openjdk8-openshift-rhel8 (generic), Red Hat/io.undertow.jastow-jastow (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/eap74-els-openjdk11-openshift-rhel8/eap74-els-openjdk11-openshift-rhel8generic*Not reported
Red Hat/eap74-els-openjdk17-openshift-rhel8/eap74-els-openjdk17-openshift-rhel8generic*Not reported
Red Hat/eap74-els-openjdk8-openshift-rhel8/eap74-els-openjdk8-openshift-rhel8generic*Not reported
Red Hat/io.undertow.jastow-jastowgeneric*Not reported
Red Hat/jastowgeneric*Not reported
Red Hat/jboss-eap-7/eap74-els-openjdk17-openshift-rhel8generic*Not reported
Red Hat/jboss-eap-7/eap74-els-openjdk8-openshift-rhel8generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/eap74-els-openjdk11-openshift-rhel8/eap74-els-openjdk11-openshift-rhel8, Red Hat/eap74-els-openjdk17-openshift-rhel8/eap74-els-openjdk17-openshift-rhel8, Red Hat/eap74-els-openjdk8-openshift-rhel8/eap74-els-openjdk8-openshift-rhel8.
  2. 2Review the reported fix. Source-reported workaround: 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

Evidence timeline and material changes

  1. Published upstream

    Jul 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 7, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • PostfixAdmin through 4.0.5 Stored XSS via TOTP Exception DescriptionAlso CWE-79
  • CVE-2026-121578Also CWE-79
  • TeXlyre from 0.11.0 before 0.13.5 Stored XSS via Recipe Icon ImportAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 3, 2026
References
6 linked sources
Open source record