CVE-2026-85590: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-x283-48fh-hc5w
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CWE-308
Published
Advisory Summary

CVE-2026-85590 is a HIGH security vulnerability vulnerability (CWE-308: Use of Single-factor Authentication) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-85590 at a Glance

CVE Identifier CVE-2026-85590
GHSA Identifier GHSA-x283-48fh-hc5w
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-308: Use of Single-factor Authentication
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-85590

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-2026-85590, 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-308: Use of Single-factor Authentication, where the product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor. 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

phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality. The removeTwofactorConfig() handler (reachable via POST /api/user/remove-twofactor) verifies only that the user is logged in and that a valid CSRF token is supplied, then disables TOTP without requiring password re-entry or a current TOTP code. The same downgrade is also reachable inline via PUT /api/user/data/update, which accepts a plain twofactor_enabled form field under the same session+CSRF-only guard. An attacker who has hijacked a user's session can silently strip two-factor protection from any account, including administrator accounts, after which password-only authentication succeeds.

References

GitHub Advisory / Wiki ADVISORY
https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m
NVD — CVE-2026-85590 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85590
www.vulncheck.com/advisories/phpmyfaq... WEB
https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-authentication-bypass-via-two-factor-disable

Frequently Asked Questions

What is CVE-2026-85590?
CVE-2026-85590 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-308: Use of Single-factor Authentication.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-85590?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-85590?
CVE-2026-85590 is classified under CWE-308: Use of Single-factor Authentication (The product uses an authentication algorithm that uses a single factor (e.g., a password) in a security context that should require more than one factor.).
How can I check Maven dependencies for CVE-2026-85590?
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-x283-48fh-hc5w",
  "modified" : "2026-09-04T12:30:59Z",
  "published" : "2026-09-04T12:30:59Z",
  "aliases" : [ "CVE-2026-85590" ],
  "details" : "phpMyFAQ before 4.1.8 contains an authentication bypass vulnerability in its two-factor authentication (TOTP) disable functionality. The removeTwofactorConfig() handler (reachable via POST /api/user/remove-twofactor) verifies only that the user is logged in and that a valid CSRF token is supplied, then disables TOTP without requiring password re-entry or a current TOTP code. The same downgrade is also reachable inline via PUT /api/user/data/update, which accepts a plain twofactor_enabled form field under the same session+CSRF-only guard. An attacker who has hijacked a user's session can silently strip two-factor protection from any account, including administrator accounts, after which password-only authentication succeeds.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/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" : "WEB",
    "url" : "https://github.com/thorsten/phpMyFAQ/security/advisories/GHSA-h96g-59xp-7r5m"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-85590"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/phpmyfaq-before-4.1.8-authentication-bypass-via-two-factor-disable"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-308" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-04T12:17:21Z"
  }
}