Medium severity · published Jul 7, 2026
CVE-2025-12799
Jastow: jastow cross-site scripting attack due to unsanitized uri
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat JBoss Enterprise Application Platform 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform 8.1.7.GA · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat JBoss Enterprise Application Platform Expansion Pack · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Single Sign-On 7 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat JBoss Enterprise Application Platform 7
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-12799
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-12799
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36342
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36343
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36344
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36345
access.redhat.com
https://access.redhat.com/security/cve/CVE-2025-12799
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2413071
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