CVE-2026-45243: @steipete/summarize Summarize Contains A Missing Authorization Vulnerability

MODERATE
Advisory Identifier: GHSA-5624-2pmv-jx46
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CVSS 6.1
CWE-862
Published
Advisory Summary

CVE-2026-45243 is a MODERATE (CVSS 6.1) summarize contains a missing authorization vulnerability (CWE-862: Missing Authorization) affecting @steipete/summarize libraries in the npm ecosystem. The issue involves summarize contains a missing authorization vulnerability. Remediation is available by upgrading affected packages to version 0.15.0.

CVE-2026-45243 at a Glance

CVE Identifier CVE-2026-45243
GHSA Identifier GHSA-5624-2pmv-jx46
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-862: Missing Authorization
Affected Product @steipete/summarize
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-45243

To remediate this vulnerability, upgrade all affected @steipete/summarize dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@steipete/summarize fixed: 0.15.0 
npm install @steipete/summarize@0.15.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls @steipete/summarize

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-45243, inspect your project dependencies using npm:

npm ls @steipete/summarize

Analyze the terminal output to locate any version of @steipete/summarize in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.15.0), your application is affected.

Note: The npm ls @steipete/summarize command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In @steipete/summarize, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Summarize prior to 0.15.0 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.

CVE-2026-45243 Affected @steipete/summarize Versions

1 component(s)
Fixed Versions:
0.15.0
Product / Package Ecosystem Affected Versions Fixed Version
@steipete/summarize
npm/@steipete/summarize
npm
< 0.15.0
0.15.0

References

NVD — CVE-2026-45243 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45243
@steipete/summarize Source Repository REPOSITORY
https://github.com/steipete/summarize/pull/222
Security Fix Commit FIX COMMIT
https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd
@steipete/summarize Source Repository REPOSITORY
https://github.com/steipete/summarize
@steipete/summarize Release RELEASE
https://github.com/steipete/summarize/releases/tag/v0.15.1
@steipete/summarize Release RELEASE
https://github.com/steipete/summarize/releases/tag/v0.15.2
www.vulncheck.com/advisories/summariz... WEB
https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script

Frequently Asked Questions

What is CVE-2026-45243?
CVE-2026-45243 is a security vulnerability in @steipete/summarize involving Summarize contains a missing authorization vulnerability under CWE-862: Missing Authorization.
Which @steipete/summarize versions are affected?
Affected versions include releases prior to 0.15.0 across affected packages: @steipete/summarize.
What version fixes CVE-2026-45243?
Upgrading to 0.15.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @steipete/summarize affected?
Yes, @steipete/summarize is affected in releases prior to 0.15.0. Upgrade your dependency to 0.15.0 or later.
What is the CVSS score of CVE-2026-45243?
CVE-2026-45243 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-45243?
CVE-2026-45243 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check npm dependencies for CVE-2026-45243?
Run the dependency tree command: 'npm ls @steipete/summarize'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5624-2pmv-jx46",
  "modified" : "2026-05-29T19:49:41Z",
  "published" : "2026-05-18T21:31:50Z",
  "aliases" : [ "CVE-2026-45243" ],
  "summary" : "Summarize contains a missing authorization vulnerability",
  "details" : "Summarize prior to 0.15.0 contains a missing authorization vulnerability in the content script window.postMessage bridge that allows malicious pages to perform unauthorized operations on automation artifacts. Attackers can simulate runtime messages with spoofed sender identifiers to list, read, create, overwrite, or delete automation artifacts scoped to the affected tab without proper authorization checks.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@steipete/summarize"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.15.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-45243"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/steipete/summarize/pull/222"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/steipete/summarize/commit/357544063af535bd574752622f9eb94be33ee5fd"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/steipete/summarize"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/steipete/summarize/releases/tag/v0.15.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/steipete/summarize/releases/tag/v0.15.2"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/summarize-browser-extension-missing-authorization-via-content-script"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-29T19:49:41Z",
    "nvd_published_at" : "2026-05-18T19:16:28Z"
  }
}