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CVE-2026-85591· NVD / CVE Program· CNA VulnCheck

phpMyFAQ before 4.1.8 Authentication Bypass via Unverified Password Change

phpMyFAQ versions before 4.1.8 contain an authentication bypass vulnerability in the user control panel API endpoint that allows authenticated attackers to change account passwords without verifying the current password. Attackers with session access can submit a PUT request to the user data update endpoint with only a CSRF token to silently change any user's password, including administrators, causing irreversible account takeover and victim lockout.

HighCVSS 7.1 · v4.0—No exploit Fix available
Published
Sep 4, 2026
Updated
Sep 10, 2026
EPSS
0.5% · 42th percentile
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Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
7.1
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • thorsten phpMyFAQ

    • 4.1.8not affected
    • before 4.1.8affected · semver

Same product

thorsten: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-46364phpMyFAQ - SQL Injection via User-Agent Header in BuiltinCaptcha
    38Monitor
  • CVE-2026-66398phpMyFAQ before 4.1.6 Remote Code Execution via Configuration API
    37Monitor
  • CVE-2026-45010phpMyFAQ - Unauthenticated Two-Factor Authentication Brute-Force via /admin/check Endpoint
    37Monitor
  • CVE-2026-35676phpMyFAQ - Unauthenticated Password Reset via User Password Update Endpoint
    35Monitor
  • CVE-2026-35675phpMyFAQ - Authentication Bypass via Missing Password Reset Token in /api/user/password/update
    35Monitor
  • CVE-2026-56738phpMyFAQ has SQL Injection in `StopWords::add()` — Unescaped Stop Word Insertion
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
thorsten phpMyFAQ4.1.8Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

—

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-6639839 days apartphpMyFAQ before 4.1.6 Remote Code Execution via Configuration API
    37Monitor
  • CVE-2026-5673820 days apartphpMyFAQ has SQL Injection in `StopWords::add()` — Unescaped Stop Word Insertion
    34Monitor
  • CVE-2026-6639739 days apartphpMyFAQ before 4.1.6 Path Traversal via category image deletion
    34Monitor
  • CVE-2026-46360112 days apartphpMyFAQ - Stored XSS via Entity Decoding Depth Limit Bypass in SVG Sanitizer
    20Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-620 · Unverified Password Change

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records