[NEW] [medium] Red Hat JBoss Enterprise Application Platform (io.undertow.jastow): Vulnerability allows cross-site scripting

mediumCVE-2025-12799

A remote, anonymous attacker can exploit a vulnerability in Red Hat JBoss Enterprise Application Platform to conduct a cross-site scripting attack.

CSIRTS triage

vendor: Red Hat product: Red Hat JBoss Enterprise Application Platform Cross-site scripting

What: A vulnerability allows a remote, anonymous attacker to conduct a cross-site scripting attack.
Who is affected: Deployments of Red Hat JBoss Enterprise Application Platform are affected by this vulnerability.
Urgency: Remediation is medium priority due to the medium severity of the vulnerability and the potential for exploitation.
Action: Update Red Hat JBoss Enterprise Application Platform to the latest version to address this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-08
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2227

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-127990.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-12799	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumCVE-2025-12799: A flaw was found in Jastow. Jastow is vulnerable to Cross-Site Scripting (XSS) attack. If usin…nvd

Recent advisories for Red Hat JBoss

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[UPDATE] [medium] Red Hat JBoss Enterprise Application Platform (bouncycastle): Vulnerability allows informati…cert-bund · 2026-07-10
high[UPDATE] [high] Red Hat JBoss Enterprise Application Platform: Multiple vulnerabilitiescert-bund · 2026-07-06
medium[UPDATE] [medium] Red Hat JBoss Enterprise Application Platform: Vulnerability allows denial of servicecert-bund · 2026-07-02
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criticalexploitedCVE-2010-0738: Red Hat JBoss Authentication Bypass Vulnerabilitycisa-kev · 2022-05-25
criticalexploitedCVE-2010-1428: Red Hat JBoss Information Disclosure Vulnerabilitycisa-kev · 2022-05-25