CVE-2026-50888: Koillection/koillection Koillection Has An Authenticated Server-Side Vulnerability

HIGH
Advisory Identifier: GHSA-gmxh-hjfv-qc2w
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CVSS 8.1
CWE-918
Published
Advisory Summary

CVE-2026-50888 is a HIGH (CVSS 8.1) koillection has an authenticated server-side vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Koillection/koillection libraries in the Packagist ecosystem. The issue involves koillection has an authenticated server-side request forgery issue. Remediation is available by upgrading affected packages to version 1.8.4.

CVE-2026-50888 at a Glance

CVE Identifier CVE-2026-50888
GHSA Identifier GHSA-gmxh-hjfv-qc2w
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Koillection/koillection
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

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

How to Fix CVE-2026-50888

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

koillection/koillection fixed: 1.8.4 
Upgrade koillection/koillection to 1.8.4
Verify Direct and Transitive Dependencies

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

inspect dependencies for koillection/koillection

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-50888, inspect your project dependencies for Koillection/koillection:

inspect dependencies for koillection/koillection

Analyze the terminal output to locate any version of Koillection/koillection in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Koillection/koillection, 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

An authenticated Server-Side Request Forgery (SSRF) in the custom scraper subsystem component of Benjamin Jonard Koillection v1.8.0 allows attackers to scan internal resources via supplying a crafted URL.

CVE-2026-50888 Affected Koillection/koillection Versions

1 component(s)
Fixed Versions:
1.8.4
Product / Package Ecosystem Affected Versions Fixed Version
koillection/koillection
 Packagist
< 1.8.4
1.8.4

References

NVD — CVE-2026-50888 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50888
Koillection/koillection Source Repository REPOSITORY
https://github.com/benjaminjonard/koillection/pull/1599
Security Fix Commit FIX COMMIT
https://github.com/benjaminjonard/koillection/commit/4d445e21c631c26070f19fe8ec086a2939767ae0
Koillection/koillection Source Repository REPOSITORY
https://gist.github.com/pyuysig/d60273c1c346257ceddbf8da7134bae7
Koillection/koillection Source Repository REPOSITORY
https://github.com/benjaminjonard/koillection
Koillection/koillection Release RELEASE
https://github.com/benjaminjonard/koillection/releases/tag/1.8.4

Frequently Asked Questions

What is CVE-2026-50888?
CVE-2026-50888 is a security vulnerability in Koillection/koillection involving Koillection has an authenticated Server-Side Request Forgery issue under CWE-918: Server-Side Request Forgery (SSRF).
Which Koillection/koillection versions are affected?
Affected versions include releases prior to 1.8.4 across affected packages: koillection/koillection.
What version fixes CVE-2026-50888?
Upgrading to 1.8.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is koillection/koillection affected?
Yes, koillection/koillection is affected in releases prior to 1.8.4. Upgrade your dependency to 1.8.4 or later.
What is the CVSS score of CVE-2026-50888?
CVE-2026-50888 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-50888?
CVE-2026-50888 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Packagist dependencies for CVE-2026-50888?
Run the dependency tree command: 'inspect dependencies for koillection/koillection'. 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-gmxh-hjfv-qc2w",
  "modified" : "2026-08-27T16:44:47Z",
  "published" : "2026-06-15T21:30:41Z",
  "aliases" : [ "CVE-2026-50888" ],
  "summary" : "Koillection has an authenticated Server-Side Request Forgery issue",
  "details" : "An authenticated Server-Side Request Forgery (SSRF) in the custom scraper subsystem component of Benjamin Jonard Koillection v1.8.0 allows attackers to scan internal resources via supplying a crafted URL.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "koillection/koillection"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50888"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benjaminjonard/koillection/pull/1599"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benjaminjonard/koillection/commit/4d445e21c631c26070f19fe8ec086a2939767ae0"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/pyuysig/d60273c1c346257ceddbf8da7134bae7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/benjaminjonard/koillection"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benjaminjonard/koillection/releases/tag/1.8.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-27T16:44:47Z",
    "nvd_published_at" : "2026-06-15T20:16:31Z"
  }
}