Unauthorized session creation via reserved framework path access
An authentication bypass vulnerability exists in Vaadin 14.0.0 through 14.14.0, 23.0.0 through 23.6.6, 24.0.0 through 24.9.7 and 25.0.0 through 25.0.1, applications using Spring Security due to inconsistent path pattern matching of reserved framework paths. Accessing the /VAADIN endpoint without a trailing slash bypasses security filters, and allowing unauthenticated users to trigger framework initialization and create sessions without proper authorization. Users of affected versions using Spring Security should upgrade as follows: 14.0.0-14.14.0 upgrade to 14.14.1, 23.0.0-23.6.6 to 23.6.7, 24.0.0 - 24.9.7 to 24.9.8, and 25.0.0-25.0.1 upgrade to 25.0.2 or newer. Please note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 14, 23, 24, 25 version.
- Published
- Mar 10, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.5% · 37th percentile
- CWE
- CWE-284
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Vaadin
- 5.3
- 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:N/VA:L/SC:N/SI:N/SA:L/S:N/AU:Y/R:A/V:D/RE:L/U:Amber
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; 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 helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| vaadin | vaadin | cpe:2.3:a:vaadin:vaadin |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- vaadin vaadin10.0.0 and later · before 14.14.1
- vaadin vaadin15.0.0 and later · before 23.6.7
- vaadin vaadin24.0.0 and later · before 24.9.8
- vaadin vaadin25.0.0 and later · before 25.0.2
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Vaadin). Independent of NVD's CPE analysis and usually ahead of it.
vaadin flow
- 1.0.0 and later · up to and including 2.13.0affected · maven
- 3.0.0 and later · up to and including 23.6.7affected · maven
- 24.0.0 and later · up to and including 24.9.7affected · maven
- 25.0.0 and later · before 25.0.1affected · maven
vaadin vaadin
- 10.0.0 and later · up to and including 14.14.0affected · maven
- 15.0.0 and later · up to and including 23.6.6affected · maven
- 24.0.0 and later · up to and including 24.9.7affected · maven
- 25.0.0 and later · up to and including 25.0.1affected · maven
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Maven | com.vaadin:flow-server | from 23.0.0 · before 23.6.7 | 23.6.7 |
| Maven | com.vaadin:flow-server | from 24.0.0 · before 24.9.8 | 24.9.8 |
| Maven | com.vaadin:flow-server | from 25.0.0 · before 25.0.2 | 25.0.2 |
| Maven | com.vaadin:flow-server | before 14.14.1 | 14.14.1 |
| Maven | com.vaadin:vaadin | from 23.0.0 · before 23.6.7 | 23.6.7 |
| Maven | com.vaadin:vaadin | from 24.0.0 · before 24.9.8 | 24.9.8 |
| Maven | com.vaadin:vaadin | from 25.0.0 · before 25.0.2 | 25.0.2 |
| Maven | com.vaadin:vaadin | before 14.14.1 | 14.14.1 |
Same product
vaadin: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-31409Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-1931Monitor
- CVE-2020-36320Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 731Monitor
- CVE-2022-29567Possible information disclosure inside TreeGrid component with default data provider30Monitor
- CVE-2023-25499Possible information disclosure in non visible components26Monitor
- CVE-2026-91860Prototype Pollution in Vaadin Charts and Component Base via Unfiltered Deep Merge25Monitor
- CVE-2021-33611Reflected cross-site scripting in vaadin-menu-bar webjar resources in Vaadin 1424Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| vaadin flow | 25.0.1 | Vendor (CNA) |
| Maven:com.vaadin:flow-server | 14.14.1 | Package registry (OSV) |
| Maven:com.vaadin:flow-server | 23.6.7 | Package registry (OSV) |
| Maven:com.vaadin:flow-server | 24.9.8 | Package registry (OSV) |
| Maven:com.vaadin:flow-server | 25.0.2 | Package registry (OSV) |
| Maven:com.vaadin:vaadin | 14.14.1 | Package registry (OSV) |
| Maven:com.vaadin:vaadin | 23.6.7 | Package registry (OSV) |
| Maven:com.vaadin:vaadin | 24.9.8 | Package registry (OSV) |
| Maven:com.vaadin:vaadin | 25.0.2 | Package registry (OSV) |
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.
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.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
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-2026-27410 days apartZip Slip Path Traversal on Node Unpack9Monitor
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
- N
Weakness class (CWE)
CWE-284 · Improper Access ControlCVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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:N/AU:Y/R:A/V:D/RE:L/U:Amber
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.
Attack patterns (CAPEC)
- Embedding Scripts within ScriptsCAPEC-19likelihood: High · High
- Malicious Logic InsertionCAPEC-441likelihood: Medium · High
- Modification of Windows Service ConfigurationCAPEC-478likelihood: Low · High
- Malicious Root CertificateCAPEC-479likelihood: Low · Low
- Intent SpoofCAPEC-502
- WebView ExposureCAPEC-503
- Data Injected During ConfigurationCAPEC-536likelihood: Low · High
- Incomplete Data Deletion in a Multi-Tenant EnvironmentCAPEC-546likelihood: Low · Medium
ATT&CK techniques
- RootkitT1014
- Obfuscated Files or Information: Embedded PayloadsT1027.009
- Boot or Logon Initialization ScriptsT1037
- Taint shared contentT1080
- Server Software Component: Terminal Services DLLT1505.005
- Pre-OS Boot:BootkitT1542.003
- Create or Modify System ProcessT1543
- Create or Modify System Process: Launch AgentT1543.001
- Create or Modify System Process:Windows ServiceT1543.003
- Create or Modify System Process: Launch DaemonT1543.004
- Event Triggered Execution:Change Default File AssociationT1546.001
- Event Triggered Execution:.bash_profile and .bashrcT1546.004
- Event Triggered Execution: Accessibility FeaturesT1546.008
- Event Triggered Execution: Installer PackagesT1546.016
- Boot or Logon Autostart ExecutionT1547
- Boot or Logon Autostart Execution:Kernel Modules and ExtensionsT1547.006
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/vaadin/flow/pull/22998
- github.com/vaadin/flow/pull/23033
- github.com/vaadin/flow/pull/23034
- github.com/vaadin/flow/pull/23037
- github.com/vaadin/flow/pull/23052
- github.com/vaadin/flow/pull/23057
- vaadin.com/security/cve-2026-2742
Vendor advisories and official records. Exploit/PoC links are deliberately left out.