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Back to active CVEs
Medium · CVSS 5.3CVE-2026-92360

ag-ui-protocol ag-ui Event Application Layer agent.ts prepareRunAgentInput origin validationCVE-2026-92360

Answer in brief

CVE-2026-92360 records a Medium severity (CVSS 5.3) vulnerability in ag-ui-protocol ag-ui Event Application Layer agent.ts prepareRunAgentInput origin validation. The current sources do not mark it as known exploited. The current feed maps ag-ui-protocol/ag-ui (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 23, 2026Source checked Oct 31, 2026First seen by HOL Sep 16, 2026Material review Sep 23, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ag-ui-protocol/ag-ui (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ag-ui-protocol/ag-uigeneric1.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ag-ui-protocol/ag-ui.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
  • Source referencevuldb.com
Upstream source description

A weakness has been identified in ag-ui-protocol ag-ui 1.0. The impacted element is the function prepareRunAgentInput of the file agent/agent.ts of the component Event Application Layer. This manipulation of the argument TEXT_MESSAGE_START causes origin validation error. Remote exploitation of the attack is possible. The pull request to fix this issue awaits acceptance.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-346, CWE-345
Source
CVE List V5
Source checked
Oct 31, 2026
References
7 linked sources
Open source record