Origin validation error in the connect-xcors npm package (CVE-2026-18825) | HOL Guard CVE

Medium · CVSS 5.3CVE-2026-18825

Origin validation error in the connect-xcors npm package

Answer in brief

CVE-2026-18825 records a Medium severity (CVSS 5.3) vulnerability in Origin validation error in the connect-xcors npm package. The current sources do not mark it as known exploited. The current feed maps github.com/antono/connect-xcors (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 28, 2026Updated Sep 28, 2026Source checked Sep 28, 2026First seen by HOL Sep 28, 2026Material review Sep 28, 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 github.com/antono/connect-xcors (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
github.com/antono/connect-xcorsgeneric	>=0 <=0.5.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for github.com/antono/connect-xcors.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 28, 2026

Sources and claim methodology

Source referencecds.thalesgroup.com

Upstream source description

An Origin Validation Error in the middleware of the connect-xcors npm package allows an attacker to bypass origin verification and perform a cross domain authenticated request.

Quoted source text, attributed separately from HOL analysis.