CVE-2026-120326 (GCVE-0-2026-120326)

Vulnerability from cvelistv5 – Published: 2026-11-10 11:49 – Updated: 2026-11-10 11:49
VLAI
Title
Unescaped Download File Name Allows Content-Disposition Parameter Injection in Vaadin Flow
Summary
DownloadEvent.setFileName(String) in Vaadin Flow writes the download file name into the Content-Disposition header without escaping it. When the name is pure US-ASCII the header is built as attachment; filename="<name>" with the name inserted verbatim, so a double quote in the name ends the quoted string early and the rest of the name is read by the browser as further header parameters. The inline(String) variant, present from Vaadin 25.0, builds the name the same way. An application that passes an untrusted file name to either method, for example when re-serving a file under the name it was uploaded with, lets an attacker add a filename* parameter. Browsers prefer filename* over filename, so the file is saved under a name and extension of the attacker's choosing, which defeats any file name or extension restriction the application enforces. The attacker cannot change the attachment or inline disposition itself and cannot split the header. Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include: Product version Vaadin 24.8.0 - 24.8.17 Vaadin 24.9.0 - 24.9.25 Vaadin 24.10.0 - 24.10.13 Vaadin 25.0.0 - 25.0.13 Vaadin 25.1.0 - 25.1.13 Vaadin 25.2.0 - 25.2.12 Vaadin 25.3.0 - 25.3.4 Mitigation No fixed release on this line, upgrade to 24.9.26 or newer Upgrade to 24.9.26 Upgrade to 24.10.14 No fixed release on this line, upgrade to 25.2.13 or newer No fixed release on this line, upgrade to 25.2.13 or newer Upgrade to 25.2.13 Upgrade to 25.3.5 Vaadin versions below 24.8 are not affected: the DownloadEvent API does not exist in them.
Severity
4.8 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CWE
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
Vaadin CNA under the mitre root
CNA scorecard – unranked: 9 records in the last 180 days, 10 needed details
References
Impacted products
Vendor Product Version CPE status
vaadin vaadin Affected: 24.8.0 , ≤ 24.8.17 (maven)
Affected: 24.9.0 , < 24.9.26 (maven)
Affected: 24.10.0 , < 24.10.14 (maven)
Affected: 25.0.0 , ≤ 25.0.13 (maven)
Affected: 25.1.0 , ≤ 25.1.13 (maven)
Affected: 25.2.0 , < 25.2.13 (maven)
Affected: 25.3.0 , < 25.3.5 (maven)
guessed Create a notification for this product.
vaadin vaadin-core Affected: 24.8.0 , ≤ 24.8.17 (maven)
Affected: 24.9.0 , < 24.9.26 (maven)
Affected: 24.10.0 , < 24.10.14 (maven)
Affected: 25.0.0 , ≤ 25.0.13 (maven)
Affected: 25.1.0 , ≤ 25.1.13 (maven)
Affected: 25.2.0 , < 25.2.13 (maven)
Affected: 25.3.0 , < 25.3.5 (maven)
guessed Create a notification for this product.
vaadin flow Affected: 24.8.0 , ≤ 24.8.16 (maven)
Affected: 24.9.0 , < 24.9.31 (maven)
Affected: 24.10.0 , < 24.10.17 (maven)
Affected: 25.0.0 , ≤ 25.0.15 (maven)
Affected: 25.1.0 , ≤ 25.1.19 (maven)
Affected: 25.2.0 , < 25.2.16 (maven)
Affected: 25.3.0 , < 25.3.6 (maven)
guessed Create a notification for this product.
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          }
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        "id": "CVE-2026-120326",
        "lastModified": "2026-11-10T12:17:16.967",
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                "availabilityRequirement": "NOT_DEFINED",
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "LOW",
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                "version": "4.0",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "source": "security@vaadin.com",
              "type": "Secondary"
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        "published": "2026-11-10T12:17:16.837",
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            "url": "https://vaadin.com/security/cve-2026-120326"
          }
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        "sourceIdentifier": "security@vaadin.com",
        "vulnStatus": "Awaiting Analysis",
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            "type": "Secondary"
          }
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    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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