Jenkins Penetration Testing
Jenkins is usually the oldest machine with the most credentials and the least attention. A controller reachable from the internal network with an unpatched plugin is one of the shortest paths to the whole estate. CREST-certified testers, fixed price from £2,670, 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, CelloriA long-lived Jenkins controller accumulates credentials for source control, container registries, cloud accounts and production servers, and it stores them so jobs can use them. Reaching the controller usually means reaching all of it.
Why Jenkins is the highest-value legacy system you own
The script console is the single most direct path, because it executes Groovy on the controller with full privilege. Where anonymous read is enabled, or where a low-privilege user can reach it, the outcome is immediate and total.
Plugins are the slower path and the more common one. Jenkins plugin advisories are frequent and plugins are rarely updated on a schedule, so an installation two years behind carries a long list of known, reachable issues.
ISO 27001, SOC 2, PCI DSS and Cyber Essentials Plus audits accept manual penetration test evidence. Scan-only evidence is generally insufficient.
CONSOLE, CREDENTIALS + PLUGINS
What we actually pen test on a Jenkins installation
Manual pen testing across the script console, job configuration, the credential store, plugin vulnerabilities, agent isolation and anonymous access.
Script console and Groovy execution
Whether the script console is reachable and by whom, Groovy sandbox enforcement in pipelines, approval queue handling, and whether a job definition can execute code on the controller.
Credential store exposure
Every stored credential enumerated by scope, whether a job can print or exfiltrate a credential it is permitted to use, credential binding in pipelines, and secrets left in job configuration or build logs.
Authentication and authorisation
Anonymous read access, matrix or role-based strategy configuration, whether a low-privilege user can configure or trigger jobs beyond their remit, and API token handling.
Plugin and core vulnerabilities
Jenkins core and every installed plugin version-matched against the security advisories, with manual verification of anything reachable in your configuration and authentication state.
Agent and node isolation
Agent to controller security, whether agents can reuse workspaces or reach each other, what the agent identity holds, and whether a build can escape to the host.
Exposure and network position
Whether the controller is reachable from the internet or from user networks, TLS configuration, the JNLP and agent ports, and what the controller can reach outbound.
METHODOLOGY
Jenkins 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 Jenkins 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.
Your data stays with us. No newsletter signup.
or book a 20-min scoping call first
We reply within one business day. Your data stays with us. No newsletter signup.
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 Jenkins 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
Jenkins 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 Jenkins 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
Our Jenkins is internal only. Is it worth testing?
Usually the most worth testing. Internal-only tends to mean less hardened, and an attacker who has phished one workstation is on the internal network. We test it from the position an intruder would actually occupy.
Can you test without disrupting builds?
Yes. We avoid triggering production deployment jobs entirely, work read-only on configuration by default, and agree a window for anything that could queue work. Nothing intrusive happens without your sign-off.
Do you need an administrator account?
We want to test as several privilege levels, including anonymous and a standard developer account, because the interesting question is what each can reach. An administrator account helps us enumerate, but the findings come from the lower privileges.
What about Jenkins on Kubernetes?
In scope, and the agent isolation questions get more interesting. Dynamic agents in pods raise service account scope, namespace boundaries and whether a build can reach the cluster API, which we test alongside the Kubernetes page scope if you want both.
What do we receive?
A report mapped to ISO 27001, SOC 2 and Cyber Essentials where relevant, a prioritised remediation plan, and unlimited free retesting until every finding closes.
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 Jenkins review
Tell us the version, roughly how many jobs and plugins you run, and where the controller sits on the network. Fixed-price quote within one business day.
