CVE-2026-50887: Shlinkio/shlink Shlink Has A Server-Side Request Vulnerability

CRITICAL
Advisory Identifier: GHSA-p85r-x2wj-mxqj
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CVSS 9.1
CWE-918
Published
Advisory Summary

CVE-2026-50887 is a CRITICAL (CVSS 9.1) shlink has a server-side request vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Shlinkio/shlink libraries in the Packagist ecosystem. The issue involves shlink has a server-side request forgery issue. Remediation is available in the latest vendor maintenance releases.

CVE-2026-50887 at a Glance

CVE Identifier CVE-2026-50887
GHSA Identifier GHSA-p85r-x2wj-mxqj
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Shlinkio/shlink
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.1

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:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2026-50887

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

shlinkio/shlink fixed: Latest secure release 
Upgrade shlinkio/shlink to Latest secure release
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 shlinkio/shlink

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-50887, inspect your project dependencies for Shlinkio/shlink:

inspect dependencies for shlinkio/shlink

Analyze the terminal output to locate any version of Shlinkio/shlink in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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 Shlinkio/shlink, 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

A Server-Side Request Forgery (SSRF) in the automatic short URL title resolution component of shlink v5.0.1 allows attackers to scan internal resources via supplying a crafted longUrl.

CVE-2026-50887 Affected Shlinkio/shlink Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
shlinkio/shlink
 Packagist
≤ 5.0.1

References

NVD — CVE-2026-50887 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50887
Shlinkio/shlink Source Repository REPOSITORY
https://gist.github.com/pyuysig/9de95fb39eb089a4346570d791af99a6
Shlinkio/shlink Source Repository REPOSITORY
https://github.com/shlinkio/shlink

Frequently Asked Questions

What is CVE-2026-50887?
CVE-2026-50887 is a security vulnerability in Shlinkio/shlink involving shlink has a Server-Side Request Forgery issue under CWE-918: Server-Side Request Forgery (SSRF).
Which Shlinkio/shlink versions are affected?
Affected versions include releases prior to current release patches across affected packages: shlinkio/shlink.
What version fixes CVE-2026-50887?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is shlinkio/shlink affected?
Yes, shlinkio/shlink is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-50887?
CVE-2026-50887 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-50887?
CVE-2026-50887 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-2026-50887?
Run the dependency tree command: 'inspect dependencies for shlinkio/shlink'. 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-p85r-x2wj-mxqj",
  "modified" : "2026-08-27T16:42:21Z",
  "published" : "2026-06-15T21:30:41Z",
  "aliases" : [ "CVE-2026-50887" ],
  "summary" : "shlink has a Server-Side Request Forgery issue",
  "details" : "A Server-Side Request Forgery (SSRF) in the automatic short URL title resolution component of shlink v5.0.1 allows attackers to scan internal resources via supplying a crafted longUrl.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "shlinkio/shlink"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "5.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50887"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/pyuysig/9de95fb39eb089a4346570d791af99a6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/shlinkio/shlink"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-27T16:42:21Z",
    "nvd_published_at" : "2026-06-15T20:16:31Z"
  }
}