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    CVE-2026-55778

    Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81.

    Published:Jul 8, 2026
    Last Modified:Jul 9, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00406
    CVSS Score:2.1

    Affected Products

    Vendor
    Parse Community
    Product
    Parse Server

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs

    Related CVEs

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    CVE-2026-66008 (CVSS 6.3) — Parse Server versions >= 9.0.0 before 9.10.0-alpha.6 and >= 8.2.2 before 8.6.87 disclose Pointer and Relation …
    CVE-2026-64627 (CVSS 6.9) — Parse Server versions >= 9.0.0 before 9.10.0-alpha.4 and versions before 8.6.85 contain a schema disclosure vu…
    CVE-2026-61448 (CVSS 2.1) — Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-a…
    CVE-2026-57481 (CVSS 2.3) — Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior …
    CVE-2026-57480 (CVSS 8.7) — Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior …
    CVE-2026-53726 (CVSS 6.9) — Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior …
    CVE-2026-53725 (CVSS 5.9) — Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. From v…
    CVE-2026-53724 (CVSS 2.1) — Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High