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NVD / CVE Program· CNA Vaadin

CVE-2026-2742: Unauthorized session creation via reserved framework path access

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.44% (FIRST EPSS).
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: vaadin flow 25.0.1.

Low priority for now. Upgrade to vaadin flow 25.0.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v4.0—No exploit Fix available
Published
Mar 10, 2026
Updated
Jun 17, 2026
EPSS
0.4% · 38th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

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.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-2742

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
vaadinvaadin

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.

EcosystemPackageAffected rangeFix
Mavencom.vaadin:flow-serverfrom 23.0.0 · before 23.6.723.6.7
Mavencom.vaadin:flow-serverfrom 24.0.0 · before 24.9.824.9.8
Mavencom.vaadin:flow-serverfrom 25.0.0 · before 25.0.225.0.2
Mavencom.vaadin:flow-serverbefore 14.14.114.14.1
Mavencom.vaadin:vaadinfrom 23.0.0 · before 23.6.723.6.7
Mavencom.vaadin:vaadinfrom 24.0.0 · before 24.9.824.9.8
Mavencom.vaadin:vaadinfrom 25.0.0 · before 25.0.225.0.2
Mavencom.vaadin:vaadinbefore 14.14.114.14.1

Same product

vaadin: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-107588Multiple Vulnerabilities in the Highcharts Library Bundled with Vaadin Charts
    33Monitor
  • CVE-2021-31409Server session is not invalidated when logout() helper method of Authentication module is used in Vaadin 18-19
    31Monitor
  • CVE-2020-36320Regular expression Denial of Service (ReDoS) in EmailValidator class in Vaadin 7
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-15022Jan 5, 2026 · Cross-site scripting in Action caption
    19Monitor
  • ← EarlierCVE-2026-2741Mar 10, 2026 · Zip Slip Path Traversal on Node Unpack
    9Monitor
  • Later →CVE-2026-91860Sep 30, 2026 · Prototype Pollution in Vaadin Charts and Component Base via Unfiltered Deep Merge
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
vaadin flow25.0.1Vendor (CNA)
Maven:com.vaadin:flow-server14.14.1Package registry (OSV)
Maven:com.vaadin:flow-server23.6.7Package registry (OSV)
Maven:com.vaadin:flow-server24.9.8Package registry (OSV)
Maven:com.vaadin:flow-server25.0.2Package registry (OSV)
Maven:com.vaadin:vaadin14.14.1Package registry (OSV)
Maven:com.vaadin:vaadin23.6.7Package registry (OSV)
Maven:com.vaadin:vaadin24.9.8Package registry (OSV)
Maven:com.vaadin:vaadin25.0.2Package 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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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 Unpack
    9Monitor

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 Control

CVSS 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.

Change log

  1. Fix✗ → ✓

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References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records