shouldiuse.io

VERDICT

Should I use FusionAuth?

Complete auth software and user management: SSO, MFA, OAuth2 and OpenID Connect. - fusionauth.io

Depends. Buy if you have engineers who want complete control over authentication, authorization, and identity data. Skip if you're a small team wanting managed, hands-off auth — pick a hosted provider instead.

Confidence

Medium. Based on 14 public sources; pricing figures and detailed user reviews were largely unpublished in sources reviewed.

Ratings

  • Value for money
  • Ease of useNo usable evidence in sources reviewed
  • Feature depth
  • Support qualityNo usable evidence in sources reviewed
  • Security posture

Pricing

Not disclosed

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed

Best for

  • Developer teams wanting full auth control
  • Multi-tenant SaaS platforms
  • Teams migrating off Auth0 or Okta
  • Self-hosters

Not for

  • Small teams needing simple email/password login
  • No-code founders or ops-only buyers
  • Teams wanting zero-maintenance managed auth
  • Orgs without patching discipline

Gotchas - check before you buy

high

Two CVEs on record (RCE, file read); patch discipline is mandatory, not optional.

medium

Pricing not published in sources reviewed — confirm costs and per-user math directly before committing.

low

Few detailed user reviews found — thin evidence base beyond vendor and analyst claims.

Pros and cons

Pros

  • Complete suite: SSO, MFA, OAuth2, OIDC, user management
  • API-first design gives businesses complete control over authentication
  • Positioned as credible alternative to Auth0 and Okta
  • Vendor allows external vulnerability research and testing
  • Pricing model designed to attract developers

Cons

  • Past remote code execution vulnerability (CVE-2020-7799)
  • Directory traversal file-read bug before v1.41.3 (CVE-2022-45921)
  • Developer-oriented; complete control means you operate it
  • Detailed public review scores scarce in sources reviewed

Sources & method

Analyzed 9/20/2026 - 8 sources - Two CVEs (RCE in 2020, file read fixed in 1.41.3); vendor runs an active disclosure and testing program.

official x2review x2security x3news x1
  • CVE-2020-7799 — Remote Code Execution, Remote code execution vulnerability disclosed January 2020; patched in later releases.
  • CVE-2022-45921 — Directory traversal / file read, FusionAuth before 1.41.3 allows files outside the application root to be viewed; fixed in 1.41.3.

Key stats

  • Value for money: 4/5

    Rating

  • Not disclosed

    Starting price

  • 8

    Sources

  • Analyzed

  • Value for money: 4/5. Pricing model designed to attract developers, per competitive analysis
  • Ease of use. No usable evidence in sources reviewed
  • Feature depth: 5/5. SSO, MFA, OAuth2, OIDC, full user management
  • Support quality. No usable evidence in sources reviewed
  • Security posture: 3/5. Two CVEs on record; active disclosure program
  • 79/100 Trust score Gridinsoft, no blacklist detections
  • DR 80 Domain rating rating.so
  • 2 Public CVEs RCE (2020) and file read (2022), both patched

Pricing

Not disclosed

Security

Two CVEs (RCE in 2020, file read fixed in 1.41.3); vendor runs an active disclosure and testing program.

  • CVE-2020-7799 — Remote Code ExecutionRemote code execution vulnerability disclosed January 2020; patched in later releases.⁵
  • CVE-2022-45921 — Directory traversal / file readFusionAuth before 1.41.3 allows files outside the application root to be viewed; fixed in 1.41.3.⁴

What users say

Sources reviewed contain no verbatim user feedback; SourceForge lists reviews but no quoted ratings surfaced.

Full analysis

Based on 14 public sources; pricing figures and detailed user reviews were largely unpublished in sources reviewed.

Developer-first CIAM with deep control and two CVEs on record. Great for engineers; overkill if you want hands-off hosted auth.

Methodology

Based on 14 public sources; pricing figures and detailed user reviews were largely unpublished in sources reviewed.

Sources

  1. FusionAuth Reviews in 2026sourceforge.net
    review
  2. FusionAuth: Authentication & User Management Softwarefusionauth.io
    official
  3. FusionAuth Security & Compliancefusionauth.io
    official
  4. CVE-2022-45921 — NVDnvd.nist.gov
    security
  5. FusionAuth RCE Vulnerability CVE-2020-7799nsfocusglobal.com
    security
  6. FusionAuth Competitive Intelligence & Landscapeforesightiq.co
    news
  7. Which are the best alternatives to Auth0 and Okta?quora.com
    review
  8. fusionauth.io Trust Score 79/100gridinsoft.com
    security

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