Umbraco Penetration Testing for .NET Content Estates
Umbraco sites tend to be built once, properly, then extended for years by different hands. We pen test what that leaves behind: an exposed back office, members who can reach more than they should, and packages nobody has updated since launch. CREST-certified testers, fixed price from £2,680, scoped in 24 hours.
- Unlimited retesting
- No rescheduling or cancellation fees
- Fixed quote within 24 hours
“I would highly recommend EJN Labs to any organisation seeking reliable, detailed, and well-managed penetration testing services, particularly for government or enterprise-level projects.”
Imran SaghirProject Lead, SquareOne“There wasn’t another company we could find that could deliver what we needed in the timeframe we needed. The client loved it, and we got instant ROI from the engagement.”
Dan WilcocksonCo-Founder, CelloriUmbraco is a .NET application before it is a CMS, so it inherits both sets of problems. The content model, member groups and public access rules behave like any CMS permission system, while the surrounding code is ASP.NET with all the model binding, serialisation and configuration questions that brings.
Why Umbraco sits between a CMS test and a .NET test
The finding we raise most often is the simplest. The back office at /umbraco is reachable from the internet with no network restriction and no multi-factor authentication, protected by nothing more than a password that has not changed since the build.
After that it is usually members and public access: document types marked protected in one branch and not another, or a member group that inherits its way into a restricted section. Umbraco is one of several content platforms we publish pages for.
ISO 27001, SOC 2, PCI DSS and Cyber Essentials Plus audits accept manual penetration test evidence. Scan-only evidence is generally insufficient.
BACK OFFICE, MEMBERS + PACKAGES
What we actually pen test on an Umbraco site
Manual pen testing across the back office, the member and public access model, installed packages and the .NET surface underneath.
Back office exposure and access
Whether the back office is reachable from the internet, whether multi-factor authentication is enforced for users, login throttling, and what a low-privilege back office user can reach beyond their assigned section.
Members and public access
Member group assignment, protected document types and whether public access rules hold across the whole branch, including whether restricted content leaks through search, sitemaps or the Content Delivery API.
Package and dependency vulnerabilities
Installed packages and NuGet dependencies enumerated and version-matched, with manual verification of anything handling upload, authentication or rendering.
Razor and template handling
Server-side template injection in Razor views, unsafe use of raw HTML output, and rich text fields that can carry script into a page viewed by a back office user.
Media and file handling
Media upload validation, path traversal, whether uploaded files can be executed, and whether media marked as protected is genuinely unreachable by direct URL.
Configuration and .NET surface
appsettings and connection string exposure, verbose error pages, debug settings left enabled, model binding and mass assignment on custom controllers, and any exposed management endpoints.
METHODOLOGY
Umbraco Penetration Testing: From Scope to Attestation
CREST-aligned methodology built on OWASP Web Security Testing Guide, OWASP ASVS, NIST SP 800-115, and PTES. Each finding maps to all four standards plus your specific compliance regime.
Reconnaissance
Application mapping, technology fingerprinting, content discovery, parameter enumeration, authentication-flow analysis, role-matrix construction.
Vulnerability Assessment
Authenticated and unauthenticated automated scanning across every user role, plus targeted manual checks for known weakness patterns.
Manual Exploitation
Hands-on testing by a CREST-certified pentester. Business-logic exploitation, chained vulnerabilities, privilege escalation, impact validation.
Reporting + Retest
Executive summary, technical report with CVSS scores and reproduction steps, walkthrough call, free retest after remediation, attestation letter.
CREDENTIALS
Verified Accreditations Auditors Accept
Every credential below is independently verifiable. UK procurement teams, FCA supervisors, ISO 27001 / SOC 2 auditors, and cyber insurance underwriters all recognise these standards.
GET YOUR QUOTE
Get a CREST Umbraco pen test quote in 24 hours
A fixed-price quote back in one business day, from a named CREST assessor. No sales pipeline, no chasing.
- CREST and IASME accredited. Testing your auditors and clients already recognise.
- Fast-track testing within 24 hours where required. Free retest of every fix included.
- Live findings via your client portal, not a four-week PDF.
- Fixed price from £3,500 for a single-role, single-app scope, agreed up front. Most engagements run £5,000 and up. No day-rate surprises.
Dan WilcocksonCo-Founder, CelloriUnder NDA Further named references available on a scoping call.
- We reply within one business day with a fixed-price quote from a named CREST assessor.
- You approve the scope and we book a start date, usually within 24 hours.
- Live findings land in your client portal as we test, with a free retest of every fix.
Get your fixed pen test quote in 24 hours
Quote request received
We will reply within one business day with your fixed-price quote from a named CREST assessor.
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COMPLIANCE READY
Reports Mapped to Every Framework
Findings are explicitly tagged to the relevant control reference. Your audit team submits the report directly without translation work.
ISO 27001:2022
Annex A.8.8 management of technical vulnerabilities plus A.5.15-5.18 and A.8.2-8.5 access control validation.
SOC 2 Type I & II
CC6 logical access, CC7 system operations, CC8 change management evidence.
PCI DSS
Requirement 11.4 application penetration testing across cardholder data environments, including ecommerce penetration testing for online retail platforms.
FCA SYSC
SYSC 4.1.1R, 6.1.1R, 13 mapped to each finding for FCA-regulated firms.
UK GDPR
Article 32 effectiveness testing, customer-data security controls, ICO-acceptable evidence.
Cyber Essentials Plus
Direct certification through our IASME body status, single-vendor delivery.
PRICING
Transparent Umbraco Penetration Testing Pricing
Pricing depends on app complexity, user-role count, business-logic depth, and integration surface. The day count flexes; the included deliverables stay the same across all engagements.
2 to 3 testing days
Single user role, basic CRUD application, marketing website with auth. Around 5 working days from kickoff to report.
Get a fixed quote3 to 5 testing days
Multi-role SaaS, business application with payment integration. Around 8 to 12 working days from kickoff to report.
Get a fixed quote5 to 7 testing days
Multi-tenant platform, complex authorisation matrix, integration-heavy applications. Around 15 to 20 working days from kickoff to report.
Get a fixed quotePart of Technologies We Pen Test. These are examples of the stacks we publish pages for, not a complete list. If yours is not here we still test it. Related pages:
BY SECTOR
Umbraco Penetration Testing for Your Sector
Sector-specialist scoping for UK businesses with sector-specific compliance regimes and threat models.
Fintech & FCA-Regulated
FCA SYSC, Open Banking FAPI 1.0, PSD2 SCA, payment-flow scrutiny, KYC/AML testing.
Fintech sector pageSaaS Companies
SOC 2 Type I & II evidence, multi-tenant boundaries, role escalation, customer-tenant isolation.
SaaS sector pageLaw Firms
SRA Cyber Standard, privileged data, conveyancing fraud defence, partner-tier procurement.
Law firm sector pageHealthcare
NHS DTAC, DSP Toolkit v6, UK GDPR Article 32, EHR systems, telehealth platforms.
Healthcare sector pageInsurance
FCA / PRA Operational Resilience, cyber underwriting, claims data, broker portals.
Insurance sector pagePublic Sector
CCS / G-Cloud framework, NCSC-aligned, citizen-facing services, PSN-compliance scrutiny.
Public sector pageWHY EJN LABS
What You Get From Umbraco Penetration Testing
Six concrete differentiators competitors don’t all match.
CREST-Certified Testers, Verifiable
Every test by a CREST-certified pen tester (CRT, CCT APP, CCT INF where applicable). Verify our company status at crest-approved.org.
24-Hour Startup, Where Required
From signed scope to active testing in a single business day for incident response, audit deadlines, or regulator-driven timelines.
Live Findings, Not 4-Week PDFs
Critical issues reported during testing through your client portal. Your team remediates while testing continues.
Audit-Ready Reports
Executive summary plus full technical report with CVSS scores and explicit framework mappings (ISO 27001, SOC 2, PCI DSS, FCA SYSC).
Free Retests, Standard
Verify remediation of every finding before close-out. Letter of attestation for audit submission included. Most competitors charge £1,500-£3,000 per retest.
UK-Based CREST Testers
Every engagement performed by vetted, UK-based CREST-certified testers, matched to your needs, security clearance, and compliance scope.
FAQ
Frequently Asked
Which Umbraco versions do you test?
All of them, including Umbraco 7 and 8 estates still in production. Where a version is out of support we say so plainly and scope the test around what can actually be fixed.
Should the back office be in scope?
Yes. It is the highest-value target on the site and the most common serious finding. We need one account per user type, and ideally one member account per group as well.
Do you review our custom code?
We pen test it as part of the engagement. If you want line-by-line review of the C# as well, that is our secure code review service and we often run the two together.
Is this suitable for a public sector site?
Yes. Testing is delivered in-house by CREST-certified consultants in the UK, never subcontracted, and the report format is one public sector auditors accept. Umbraco is common across UK councils and agencies and we pen test it regularly.
What happens after the report?
A walkthrough call, then unlimited free retesting until every finding closes. There is no time limit on the retest and no fee for it.
20+ CREST-accredited testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Get a fixed price for your Umbraco site
Tell us the version, the package list and which member areas are in scope. You get a fixed-price quote from a named CREST assessor within one business day, unlimited retesting and no cancellation fees.
