CVE-2026-55809: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-66vp-2cwc-4pv3
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CVSS 9.8
CWE-915
Published
Advisory Summary

CVE-2026-55809 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-55809 at a Glance

CVE Identifier CVE-2026-55809
GHSA Identifier GHSA-66vp-2cwc-4pv3
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H).

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 High (A:H)

How to Fix CVE-2026-55809

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-2026-55809, 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-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes, where the product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. 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

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Flag attendance field allows Object Injection. This issue affects Flag attendance field versions: from 0.0.0 to 1.2.

References

NVD — CVE-2026-55809 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55809
www.drupal.org/sa-contrib-2026-049 WEB
https://www.drupal.org/sa-contrib-2026-049

Frequently Asked Questions

What is CVE-2026-55809?
CVE-2026-55809 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-55809?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-55809?
CVE-2026-55809 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-55809?
CVE-2026-55809 is classified under CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes (The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.).
How can I check Maven dependencies for CVE-2026-55809?
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-66vp-2cwc-4pv3",
  "modified" : "2026-07-13T18:30:34Z",
  "published" : "2026-07-11T00:31:48Z",
  "aliases" : [ "CVE-2026-55809" ],
  "details" : "Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Flag attendance field allows Object Injection. This issue affects Flag attendance field versions: from 0.0.0 to 1.2.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55809"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-contrib-2026-049"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-915" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-10T22:16:43Z"
  }
}