Advisory details:
github_osv / GHSA-v3f7-2p4r-mwfw
| Advisory ID | github_osv/GHSA-v3f7-2p4r-mwfw |
| Aliases |
CVE-2026-9086
|
| Summary | Keycloak vulnerable to cross-site scripting (xss) via case-insensitive uri validation bypass ### Description 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.6 |
| Risk | 3.3 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.3 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-v3f7-2p4r-mwfw/GHSA-v3f7-2p4r-mwfw.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:30049 | ||
| https://access.redhat.com/errata/RHSA-2026:30050 | ||
| https://github.com/keycloak/keycloak | ||
| https://github.com/keycloak/keycloak/security/advisories/GHSA-v3f7-2p4r-mwfw | ||
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9086.json | ||
| CVE-2026-9086 | Advisory | https://access.redhat.com/security/cve/CVE-2026-9086 |
| CVE-2026-9086 | https://nvd.nist.gov/vuln/detail/CVE-2026-9086 | |
| RHSA-2026:30083 | Advisory | https://access.redhat.com/errata/RHSA-2026:30083 |
| RHSA-2026:30084 | Advisory | https://access.redhat.com/errata/RHSA-2026:30084 |
| show_bug.cgi?id=2480170 | Bug | https://bugzilla.redhat.com/show_bug.cgi?id=2480170 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
There are no SSVC decisions available.