CVE-2026-67204: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-v32j-vgqh-f22g
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CVSS 5.4
CWE-863
Published
Advisory Summary

CVE-2026-67204 is a MODERATE (CVSS 5.4) security vulnerability vulnerability (CWE-863: Incorrect Authorization) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-67204 at a Glance

CVE Identifier CVE-2026-67204
GHSA Identifier GHSA-v32j-vgqh-f22g
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-863: Incorrect Authorization
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-67204

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-2026-67204, 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. 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

BookStack before 26.05.4 contains a broken access control vulnerability that allows authenticated API users with image-update or image-delete permissions to manipulate other users' avatars by exploiting missing content-type restrictions in the Image Gallery API endpoints. Attackers can supply a user avatar's ID to the API controller, which loads any image type without the web controller's gallery and drawio restrictions, and when the avatar's uploaded_to field matches a page ID accessible to the attacker, the authorization check passes allowing the attacker to rename, replace, or delete the target user's avatar without requiring user-management permission.

References

NVD — CVE-2026-67204 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67204
codeberg.org/bookstack/bookstack... WEB
https://codeberg.org/bookstack/bookstack/releases/tag/v26.05.4
Software Release RELEASE
https://github.com/BookStackApp/BookStack/releases/tag/v26.05.4
www.bookstackapp.com/blog/bookstack-rele... WEB
https://www.bookstackapp.com/blog/bookstack-release-v26-05-4
www.vulncheck.com/advisories/bookstac... WEB
https://www.vulncheck.com/advisories/bookstack-broken-access-control-via-image-gallery-api

Frequently Asked Questions

What is CVE-2026-67204?
CVE-2026-67204 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-863: Incorrect Authorization.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-67204?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-67204?
CVE-2026-67204 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
What CWE is associated with CVE-2026-67204?
CVE-2026-67204 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Maven dependencies for CVE-2026-67204?
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-v32j-vgqh-f22g",
  "modified" : "2026-08-24T18:31:51Z",
  "published" : "2026-08-24T18:31:51Z",
  "aliases" : [ "CVE-2026-67204" ],
  "details" : "BookStack before 26.05.4 contains a broken access control vulnerability that allows authenticated API users with image-update or image-delete permissions to manipulate other users' avatars by exploiting missing content-type restrictions in the Image Gallery API endpoints. Attackers can supply a user avatar's ID to the API controller, which loads any image type without the web controller's gallery and drawio restrictions, and when the avatar's uploaded_to field matches a page ID accessible to the attacker, the authorization check passes allowing the attacker to rename, replace, or delete the target user's avatar without requiring user-management permission.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-67204"
  }, {
    "type" : "WEB",
    "url" : "https://codeberg.org/bookstack/bookstack/releases/tag/v26.05.4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/BookStackApp/BookStack/releases/tag/v26.05.4"
  }, {
    "type" : "WEB",
    "url" : "https://www.bookstackapp.com/blog/bookstack-release-v26-05-4"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/bookstack-broken-access-control-via-image-gallery-api"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-24T16:17:17Z"
  }
}