ag-ui-protocol ag-ui CORSMiddleware utils.py create_strands_app cross-domain policy

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92359
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 13:18:08 UTC
Updated2026-09-16 17:53:40 UTC
DescriptionA 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 [email protected] is sufficient to fix this issue. The patch is identified as 9b143b9668fa52c2054ede9d34a45ac4b4401089. It is suggested to upgrade the affected component.

Risk And Classification

Primary CVSS: v4.0 2.3 LOW from [email protected]

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

Problem Types: CWE-346 | CWE-942 | CWE-942 Permissive Cross-domain Policy with Untrusted Domains | CWE-346 Origin Validation Error

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary2.3LOWCVSS: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/C...
4.0CNADECLARED2.3LOWCVSS: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
3.1[email protected]Secondary3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
3.1CNADECLARED3.1LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C
3.0CNADECLARED3.1LOWCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C
2.0[email protected]Secondary2.6AV:N/AC:H/Au:N/C:P/I:N/A:N
2.0CNADECLARED2.6AV:N/AC:H/Au:N/C:P/I:N/A:N/E:ND/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ag-ui-protocol Ag-ui affected 0.3.0 Not specified
CNA Ag-ui-protocol Ag-ui unaffected [email protected] Not specified

References

ReferenceSourceLinkTags
github.com/ag-ui-protocol/ag-ui/commit/9b143b9668fa52c2054ede9d34a45ac4b... [email protected] github.com
github.com/ag-ui-protocol/ag-ui/issues/2433 [email protected] github.com
vuldb.com/vuln/405445/cti [email protected] vuldb.com
vuldb.com/cve/CVE-2026-92359 [email protected] vuldb.com
vuldb.com/vuln/405445 [email protected] vuldb.com
vuldb.com/submit/934120 [email protected] vuldb.com
github.com/ag-ui-protocol/ag-ui/releases/tag/AGUI.Abstractions%400.0.6 [email protected] github.com
github.com/ag-ui-protocol/ag-ui [email protected] github.com
github.com/ag-ui-protocol/ag-ui/pull/2492 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: colorfullbz (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-16T00:00:00.000ZAdvisory disclosed
CNA2026-09-16T02:00:00.000ZVulDB entry created
CNA2026-09-16T07:41:24.000ZVulDB entry last update

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