CVE-2022-28923: Github.com/caddyserver/caddy/v2 Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-qpm3-vr34-h8w8
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2022-28923 is a MODERATE (CVSS 6.1) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Github.com/caddyserver/caddy/v2 libraries in the Go ecosystem. The issue involves open redirect in caddy. Remediation is available by upgrading affected packages to version 2.5.0-beta.1.

CVE-2022-28923 at a Glance

CVE Identifier CVE-2022-28923
GHSA Identifier GHSA-qpm3-vr34-h8w8
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Github.com/caddyserver/caddy/v2
Package Ecosystem Go
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-2022-28923

To remediate this vulnerability, upgrade all affected Github.com/caddyserver/caddy/v2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/caddyserver/caddy/v2 fixed: 2.5.0-beta.1 
Upgrade github.com/caddyserver/caddy/v2 to 2.5.0-beta.1
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 github.com/caddyserver/caddy/v2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-28923, inspect your project dependencies for Github.com/caddyserver/caddy/v2:

inspect dependencies for github.com/caddyserver/caddy/v2

Analyze the terminal output to locate any version of Github.com/caddyserver/caddy/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.0-beta.1), 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Github.com/caddyserver/caddy/v2, 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

Caddy v2.4.6 was discovered to contain an open redirection vulnerability which allows attackers to redirect users to phishing websites via crafted URLs

CVE-2022-28923 Affected Github.com/caddyserver/caddy/v2 Versions

1 component(s)
Fixed Versions:
2.5.0-beta.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/caddyserver/caddy/v2
golang/github.com/caddyserver/caddy/v2
Go
< 2.5.0-beta.1
2.5.0-beta.1

References

NVD — CVE-2022-28923 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-28923
Security Fix Commit FIX COMMIT
https://github.com/caddyserver/caddy/commit/78b5356f2b1945a90de1ef7f2c7669d82098edbd
Github.com/caddyserver/caddy/v2 Source Repository REPOSITORY
https://github.com/caddyserver/caddy
lednerb.de/en/publications/res... WEB
https://lednerb.de/en/publications/responsible-disclosure/caddy-open-redirect-vulnerability
pkg.go.dev/vuln/go-2023-1567 WEB
https://pkg.go.dev/vuln/GO-2023-1567

Frequently Asked Questions

What is CVE-2022-28923?
CVE-2022-28923 is a security vulnerability in Github.com/caddyserver/caddy/v2 involving Open Redirect in Caddy under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Github.com/caddyserver/caddy/v2 versions are affected?
Affected versions include releases prior to 2.5.0-beta.1 across affected packages: github.com/caddyserver/caddy/v2.
What version fixes CVE-2022-28923?
Upgrading to 2.5.0-beta.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/caddyserver/caddy/v2 affected?
Yes, github.com/caddyserver/caddy/v2 is affected in releases prior to 2.5.0-beta.1. Upgrade your dependency to 2.5.0-beta.1 or later.
What is the CVSS score of CVE-2022-28923?
CVE-2022-28923 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-2022-28923?
CVE-2022-28923 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check Go dependencies for CVE-2022-28923?
Run the dependency tree command: 'inspect dependencies for github.com/caddyserver/caddy/v2'. 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-qpm3-vr34-h8w8",
  "modified" : "2025-03-27T03:53:05Z",
  "published" : "2023-02-07T00:30:24Z",
  "aliases" : [ "CVE-2022-28923" ],
  "summary" : "Open Redirect in Caddy",
  "details" : "Caddy v2.4.6 was discovered to contain an open redirection vulnerability which allows attackers to redirect users to phishing websites via crafted URLs",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/caddyserver/caddy/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.5.0-beta.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-28923"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/caddyserver/caddy/commit/78b5356f2b1945a90de1ef7f2c7669d82098edbd"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/caddyserver/caddy"
  }, {
    "type" : "WEB",
    "url" : "https://lednerb.de/en/publications/responsible-disclosure/caddy-open-redirect-vulnerability"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2023-1567"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-15T15:35:34Z",
    "nvd_published_at" : "2023-02-06T23:15:00Z"
  }
}