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VaadinApplication

CVE-2026-2742

MEDIUM · 5.3 CVSS v3.1 Published 2026-03-10
Fix available
A fix is available. Upgrade to 14.14.1 / 23.6.7 or later.
See remediation →
62/100
Remediation priority · Elevated
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-284

The application fails to correctly restrict what a user can do or reach, so functions or resources are available to people who should not have them. Attackers simply probe for the paths where the check is missing or wrong. The fix is to enforce access-control decisions consistently on every request, evaluated against the acting user rather than assumed from context.

General guidance for the improper access control class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
VaadinApplication
Affected:>= 10.0.0, < 14.14.1>= 15.0.0, < 23.6.7>= 24.0.0, < 24.9.8>= 25.0.0, < 25.0.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 14.14.1 / 23.6.7 / 24.9.8 or later
Fixed in 14.14.123.6.724.9.8
Vendor patch github.com →
Recommended fix High confidence

14.14.1, 23.6.7, 24.9.8, or 25.0.2 (depending on starting version branch)

  1. 1. Identify the current Vaadin version in use by checking pom.xml, build.gradle, or package.json dependencies
  2. 2. Determine the applicable upgrade path based on current version (14.x → 14.14.1, 23.x → 23.6.7, 24.x → 24.9.8, or 25.x → 25.0.2)
  3. 3. Update the Vaadin dependency version in your build configuration (Maven pom.xml or Gradle build.gradle)
  4. 4. Run dependency resolution to ensure no conflicting transitive dependencies
  5. 5. Rebuild the application and run comprehensive tests, particularly authentication and authorization flows
  6. 6. Deploy the updated application to production
Caveat Review release notes for breaking changes between your current version and the target fixed version; note that Vaadin versions 10-13 and 15-22 are end-of-life and upgrading to 14/23/24/25 is recommended

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-2742 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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