CVE-2026-9086
published 2026-06-25CVE-2026-9086: A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client…
PriorityP345high7.3CVSS 3.1
AVNACLPRLUIRSUCHIHAN
EPSS
0.42%
34.0th percentile
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| redhat | build_of_keycloak | >= 26.4 < 26.4.13 | 26.4.13 |
| redhat | build_of_keycloak | >= 26.6 < 26.6.4 | 26.6.4 |
| rhbk | keycloak-operator-bundle_26.6.4-2 | — | — |
| rhbk | keycloak-rhel9 | — | — |
| rhbk | keycloak-rhel9-operator_26.6-8 | — | — |
| rhbk | keycloak-rhel9_26.6-8 | — | — |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
vendor_oracle7.5HIGH
vendor_redhat7.3HIGH
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Red Hat
keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
vendor_redhat·2026-06-25·CVSS 7.3
CVE-2026-9086 [HIGH] CWE-79 keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
Statement: This flaw is rated as High. Keycloak's client URI validation is vulnerable to a case-insensitivity issue, allowing a
Oracle
Oracle Oracle Commerce Risk Matrix: MDEX, Forge (curl) — CVE-2025-9086
vendor_oracle·2026-01-15·CVSS 7.5
CVE-2025-9086 [HIGH] Oracle Oracle Commerce Risk Matrix: MDEX, Forge (curl) — CVE-2025-9086
Oracle Oracle Commerce Risk Matrix: MDEX, Forge (curl) vulnerability
CVE: CVE-2025-9086
CVSS: 7.5
Protocol: HTTPS
Remote exploit: Yes
Affected versions: Network
Advisory: cpujan2026 (JAN 2026)
GHSA
A flaw was found in Keycloak.
ghsa_unreviewed·2026-06-25
CVE-2026-9086 [HIGH] CWE-79 A flaw was found in Keycloak.
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-9086 keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
bugzilla·2026-05-20·CVSS 7.3
CVE-2026-9086 [HIGH] CVE-2026-9086 keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
CVE-2026-9086 keycloak: Keycloak: Cross-site scripting (XSS) via case-insensitive URI validation bypass
A flaw was found in Keycloak. A remote attacker with administrative privileges, specifically those with `manage-client` permission or access to client registration endpoints, could bypass client Uniform Resource Identifier (URI) validation. This is achieved by registering a malicious client with a specially crafted redirect URI using a case-insensitive `javascript:` or `data:` scheme. This Cross-Site Scripting (XSS) vulnerability allows for arbitrary code execution in the Keycloak origin when a victim clicks the crafted link, such as in the logout flow or the Admin Console.
Bugzilla
CVE-2025-9086 rpi-imager: Curl out of bounds read for cookie path [fedora-42]
bugzilla·2025-09-12·CVSS 7.5
CVE-2025-9086 [HIGH] CVE-2025-9086 rpi-imager: Curl out of bounds read for cookie path [fedora-42]
CVE-2025-9086 rpi-imager: Curl out of bounds read for cookie path [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports fr
Bugzilla
CVE-2025-9086 mingw-curl: Curl out of bounds read for cookie path [fedora-42]
bugzilla·2025-09-12·CVSS 7.5
CVE-2025-9086 [HIGH] CVE-2025-9086 mingw-curl: Curl out of bounds read for cookie path [fedora-42]
CVE-2025-9086 mingw-curl: Curl out of bounds read for cookie path [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports fr
Bugzilla
CVE-2025-9086 davix: Curl out of bounds read for cookie path [fedora-42]
bugzilla·2025-09-12·CVSS 7.5
CVE-2025-9086 [HIGH] CVE-2025-9086 davix: Curl out of bounds read for cookie path [fedora-42]
CVE-2025-9086 davix: Curl out of bounds read for cookie path [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from re
https://access.redhat.com/errata/RHSA-2026:30049https://access.redhat.com/errata/RHSA-2026:30050https://access.redhat.com/errata/RHSA-2026:30083https://access.redhat.com/errata/RHSA-2026:30084https://access.redhat.com/security/cve/CVE-2026-9086https://bugzilla.redhat.com/show_bug.cgi?id=2480170https://access.redhat.com/errata/RHSA-2026:30049https://access.redhat.com/errata/RHSA-2026:30050https://access.redhat.com/errata/RHSA-2026:30083https://access.redhat.com/errata/RHSA-2026:30084https://access.redhat.com/security/cve/CVE-2026-9086https://bugzilla.redhat.com/show_bug.cgi?id=2480170https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json
2026-06-25
Published