EUVD-2026-80694
GHSA-fq29-84pr-2m3x
Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote via browser (AV:N) but difficult to arrange (AC:H), no auth on the default endpoint (PR:N), victim must visit a malicious page (UI:R); wildcard CORS enables limited cross-origin reads so C:L only, no I/A impact.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
1DescriptionCVE.org
A security flaw has been discovered in ag-ui-protocol ag-ui 0.3.0. The affected element is the function create_strands_app of the file integrations/aws-strands/python/src/ag_ui_strands/utils.py of the component CORSMiddleware. The manipulation results in permissive cross-domain policy with untrusted domains. The attack may be launched remotely. The attack requires a high level of complexity. The exploitability is described as difficult. Upgrading to version AGUI.Abstractions@0.0.6 is sufficient to fix this issue. The patch is identified as 9b143b9668fa52c2054ede9d34a45ac4b4401089. It is suggested to upgrade the affected component.
AnalysisAI
A permissive cross-origin resource sharing (CORS) misconfiguration in the AG-UI aws-strands Python integration (ag-ui 0.3.0) allows a remote, unauthenticated attacker who convinces a victim to load an attacker-controlled web page to issue cross-origin requests against a deployed agent endpoint and read limited response data. The flaw is confined to deployments that bootstrap a FastAPI app via create_strands_app in integrations/aws-strands/python/src/ag_ui_strands/utils.py, where the helper installs wildcard CORS (any origin, method, and header) and mounts the agent route with no authentication dependency; deployments that supply an explicit origins allowlist, set cors_enabled=False, or attach an auth dependency are not affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the AG-UI aws-strands Python integration deployed via create_strands_app using its default (pre-0.0.6) implicit wildcard CORS configuration - allowing any origin/method/header - with the agent route left unauthenticated (no auth dependency configured) and network-reachable from a victim's browser. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a low-priority, low-real-risk issue despite being a legitimate CORS misconfiguration. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: the fix is published as the release tagged AGUI.Abstractions@0.0.6 (commit 9b143b9668fa52c2054ede9d34a45ac4b4401089, PR #2492), so upgrading the affected ag-ui Python aws-strands integration to that release or later and redeploying is the primary remediation; the vendor advisory references are https://github.com/ag-ui-protocol/ag-ui/releases/tag/AGUI.Abstractions%400.0.6, https://github.com/ag-ui-protocol/ag-ui/pull/2492 and the upstream issue https://github.com/ag-ui-protocol/ag-ui/issues/2433. … Detailed patch versions, workarounds, and compensating controls in full report. |
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