CVE-2026-12746: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-3f6x-q3gv-gmfc
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CVSS 8.1
CWE-352
Published
Advisory Summary

CVE-2026-12746 is a HIGH (CVSS 8.1) security vulnerability vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-12746 at a Glance

CVE Identifier CVE-2026-12746
GHSA Identifier GHSA-3f6x-q3gv-gmfc
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Software
Package Ecosystem Maven
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:N/UI:R/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 Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-12746

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-12746, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software 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: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In Software, 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

Dancer2::Plugin::Auth::OAuth::Provider versions before 0.23 for Perl do not support the OAuth 2.0 state parameter. The authentication_url method builds the provider authorization redirect without issuing a state value, and the callback method exchanges the callback code and registers the resulting token into the session without verifying that the callback corresponds to an authorization request this session initiated. Any application that uses this plugin for OAuth 2.0 login is exposed to login cross-site request forgery: because the callback is not bound to the session that began the flow, an attacker who starts an authorization with their own provider account can deliver the resulting callback to a victim, causing the victim's session to complete the attacker's authorization and associating the attacker's provider identity and access token with that session. Where the application persists this as an account link, the attacker may retain access to the victim's account through their own provider credentials.

References

NVD — CVE-2026-12746 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12746
Security Fix Commit FIX COMMIT
https://github.com/biafra/perl-Dancer2-Plugin-Auth-OAuth/commit/806420fc2abbe13bede4461475f2f3dcd7daf5f2.patch
datatracker.ietf.org/doc/html/rfc6749 WEB
https://datatracker.ietf.org/doc/html/rfc6749#section-10.12
metacpan.org/release/biafra/danc... WEB
https://metacpan.org/release/BIAFRA/Dancer2-Plugin-Auth-OAuth-0.23/diff/BIAFRA/Dancer2-Plugin-Auth-OAuth-0.22
Software Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/07/04/9

Frequently Asked Questions

What is CVE-2026-12746?
CVE-2026-12746 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-352: Cross-Site Request Forgery (CSRF).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-12746?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-12746?
CVE-2026-12746 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-12746?
CVE-2026-12746 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-12746?
Run the dependency tree command: 'mvn dependency:tree'. 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-3f6x-q3gv-gmfc",
  "modified" : "2026-07-06T18:31:02Z",
  "published" : "2026-07-04T18:30:24Z",
  "aliases" : [ "CVE-2026-12746" ],
  "details" : "Dancer2::Plugin::Auth::OAuth::Provider versions before 0.23 for Perl do not support the OAuth 2.0 state parameter.\n\nThe authentication_url method builds the provider authorization redirect without issuing a state value, and the callback method exchanges the callback code and registers the resulting token into the session without verifying that the callback corresponds to an authorization request this session initiated.\n\nAny application that uses this plugin for OAuth 2.0 login is exposed to login cross-site request forgery: because the callback is not bound to the session that began the flow, an attacker who starts an authorization with their own provider account can deliver the resulting callback to a victim, causing the victim's session to complete the attacker's authorization and associating the attacker's provider identity and access token with that session. Where the application persists this as an account link, the attacker may retain access to the victim's account through their own provider credentials.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12746"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/biafra/perl-Dancer2-Plugin-Auth-OAuth/commit/806420fc2abbe13bede4461475f2f3dcd7daf5f2.patch"
  }, {
    "type" : "WEB",
    "url" : "https://datatracker.ietf.org/doc/html/rfc6749#section-10.12"
  }, {
    "type" : "WEB",
    "url" : "https://metacpan.org/release/BIAFRA/Dancer2-Plugin-Auth-OAuth-0.23/diff/BIAFRA/Dancer2-Plugin-Auth-OAuth-0.22"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/07/04/9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-04T18:16:28Z"
  }
}