CVE-2025-12799: Jastow: jastow cross-site scripting attack due to unsanitized uri
Vulnerability summary
CVE-2025-12799 is a medium (CVSS 6.5) vulnerability in eap8 Red Hat. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 35.1% of scored vulnerabilities.
Not severe (CVSS 6.5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 07-07-2026PublishedVulnerability first disclosed.
- 29-07-2026Last modifiedVulnerability information updated.
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 metrics
3 scores · 3 sources · 1 version- OSV · Red hatEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS trend
Probability
0.41%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.41% on 04-10-2026
Known exploited
Compare KEV catalogsNot in the CISA KEV catalog.
Not in the ENISA CNW catalog.
Not in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat200 products
- eap8< 0:1-9.el10eap
- eap8-activemq-artemis< 0:2.40.0-7.redhat_00015.1.el10eap
- eap8-activemq-artemis-cli< 0:2.40.0-7.redhat_00015.1.el10eap
- eap8-activemq-artemis-commons< 0:2.40.0-7.redhat_00015.1.el10eap
- eap8-activemq-artemis-core-client< 0:2.40.0-7.redhat_00015.1.el10eap
1 vendor · 200 products · Showing 200 of 457
References
29 links- docs.redhat.com/en/…ARTICLE
- docs.redhat.com/en/…ARTICLE