Cross-Site Scripting (XSS) in @a2ui/web_core (CVE-2026-10032)
Summary
Cross-site scripting in @a2ui/web_core (CVE-2026-10032). Risk of unauthorized operations or information disclosure. Exploitable via openUrl. Mitigation: upgrade to 0.10.2 or later.
Original description
The description as published by the source.
Summary
The openUrl function in @a2ui/web_core passes an agent-controlled URL directly to window.open() without validating the URI scheme. A malicious agent can supply a javascript: URI as the url argument of a Button component's functionCall action. When the user clicks the rendered button, arbitrary JavaScript executes in the victim application's browser origin, constituting a stored/reflected XSS. No non-default configuration is required; the Basic Catalog is enabled by default.
Details
The vulnerability exists in the openUrl function implementation within the Basic Catalog of @a2ui/web_core (commit 23a003248abbf59da6c376ea64ace91d82d209ff).
Sink — renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions.ts:428-430:
export const OpenUrlImplementation = createFunctionImplementation(OpenUrlApi, args => {
if (args.url && typeof window !== 'undefined' && window.open) {
window.open(args.url, '_blank');
}
});
window.open is called unconditionally with the agent-supplied args.url value. No scheme allowlist or blocklist is applied.
Insufficient schema validation — renderers/web_core/src/v0_9/basic_catalog/functions/basic_functions_api.ts:453-458:
export const OpenUrlApi = {
name: 'openUrl' as const,
returnType: 'void' as const,
schema: z.object({
url: z.preprocess(v => (v === undefined ? undefined : String(v)), z.string()),
}),
};
The Zod schema only requires a string; `javasc…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-10032 has been found in @a2ui/web_core.
Attackers can target a specific entry point like openUrl over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 6.1/10.
What to do: upgrade @a2ui/web_core to 0.10.2 or later.
If unsure, ask your IT team or search "@a2ui/web_core CVE-2026-10032" on the vendor's site.
CVE-2026-10032 (@a2ui/web_core) — CWE-79 / CVSS v3 6.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: openUrl / url / Button / functionCall
Patched: 0.10.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) exists in @a2ui/web_core. Attackers reach the vulnerable code path via openUrl without authentication.
Check the vendor advisory for the affected versions of @a2ui/web_core. Attack surface: openUrl / url / Button / functionCall.
Severity: Medium (CVSS 6.1/10). Risk of unauthorized operations or information disclosure.
Update to 0.10.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@a2ui/web_core' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@a2ui/web_core' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@a2ui/web_coreを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @a2ui/web_core to 0.10.2ステージング環境で 0.10.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com