CVE-2025-67202: Sidekiq cron Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-xv9c-mjw8-79gf
Share
CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2025-67202 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Sidekiq cron libraries in the RubyGems ecosystem. The issue involves sidekiq-cron is vulnerable to a cross-site scripting (xss) vulnerability via crafted url. Remediation is available by upgrading affected packages to version 2.4.0.

CVE-2025-67202 at a Glance

CVE Identifier CVE-2025-67202
GHSA Identifier GHSA-xv9c-mjw8-79gf
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Sidekiq cron
Package Ecosystem RubyGems
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-2025-67202

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

sidekiq-cron fixed: 2.4.0 
Upgrade sidekiq-cron to 2.4.0
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 sidekiq-cron

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-67202, inspect your project dependencies for Sidekiq cron:

inspect dependencies for sidekiq-cron

Analyze the terminal output to locate any version of Sidekiq cron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.4.0), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Sidekiq cron, 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

Sidekiq-cron thru 2.3.1, an open-source scheduling add-on for Sidekiq, is vulnerable to a cross-site scripting (xss) vulnerability via crafted URL being rended from cron.erb.

CVE-2025-67202 Affected Sidekiq cron Versions

1 component(s)
Fixed Versions:
2.4.0
Product / Package Ecosystem Affected Versions Fixed Version
sidekiq-cron
gem/sidekiq-cron
RubyGems
< 2.4.0
2.4.0

References

NVD — CVE-2025-67202 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67202
Sidekiq cron Source Repository REPOSITORY
https://github.com/sidekiq-cron/sidekiq-cron/issues/569
Sidekiq cron Source Repository REPOSITORY
https://github.com/sidekiq-cron/sidekiq-cron/pull/568
Security Fix Commit FIX COMMIT
https://github.com/sidekiq-cron/sidekiq-cron/commit/7b4ae4822f93ef4646f5cb55500ca4e25662db7c
Sidekiq cron Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sidekiq-cron/CVE-2025-67202.yml
Sidekiq cron Source Repository REPOSITORY
https://github.com/sidekiq-cron/sidekiq-cron
Sidekiq cron Release RELEASE
https://github.com/sidekiq-cron/sidekiq-cron/releases/tag/v2.4.0

Frequently Asked Questions

What is CVE-2025-67202?
CVE-2025-67202 is a security vulnerability in Sidekiq cron involving Sidekiq-cron is vulnerable to a cross-site scripting (xss) vulnerability via crafted URL under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Sidekiq cron versions are affected?
Affected versions include releases prior to 2.4.0 across affected packages: sidekiq-cron.
What version fixes CVE-2025-67202?
Upgrading to 2.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is sidekiq-cron affected?
Yes, sidekiq-cron is affected in releases prior to 2.4.0. Upgrade your dependency to 2.4.0 or later.
What is the CVSS score of CVE-2025-67202?
CVE-2025-67202 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-2025-67202?
CVE-2025-67202 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check RubyGems dependencies for CVE-2025-67202?
Run the dependency tree command: 'inspect dependencies for sidekiq-cron'. 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-xv9c-mjw8-79gf",
  "modified" : "2026-05-29T21:45:43Z",
  "published" : "2026-05-07T15:38:41Z",
  "aliases" : [ "CVE-2025-67202" ],
  "summary" : "Sidekiq-cron is vulnerable to a cross-site scripting (xss) vulnerability via crafted URL",
  "details" : "Sidekiq-cron thru 2.3.1, an open-source scheduling add-on for Sidekiq, is vulnerable to a cross-site scripting (xss) vulnerability via crafted URL being rended from cron.erb.",
  "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" : "RubyGems",
      "name" : "sidekiq-cron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-67202"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sidekiq-cron/sidekiq-cron/issues/569"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sidekiq-cron/sidekiq-cron/pull/568"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sidekiq-cron/sidekiq-cron/commit/7b4ae4822f93ef4646f5cb55500ca4e25662db7c"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sidekiq-cron/CVE-2025-67202.yml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sidekiq-cron/sidekiq-cron"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sidekiq-cron/sidekiq-cron/releases/tag/v2.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-12T16:19:17Z",
    "nvd_published_at" : "2026-05-07T15:16:04Z"
  }
}