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    CVE-2026-72691

    An authentication bypass vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to mint MASTER_KEY-signed file access tokens for arbitrary stored files via the getsignedurl Parse cloud function. The function skips its isAuthenticated check whenever any docId parameter is supplied, even one corresponding to no real document, allowing the authentication gate to be bypassed by supplying an arbitrary string as docId.

    Published:Aug 10, 2026
    Last Modified:Aug 11, 2026
    EPS:Aug 10, 2026
    EPSS Score:0.00393
    CVSS Score:7.5

    Affected Products

    Vendor
    Opensignlabs
    Product
    Opensignserver

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-127 Directory Indexing
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

    CVE-2026-72549 (CVSS 5.3) — An information disclosure vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote …
    CVE-2026-72548 (CVSS 7.5) — An information disclosure vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote …
    CVE-2026-72544 (CVSS 7.5) — An integrity verification vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote …
    CVE-2026-72543 (CVSS 7.5) — An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticat…
    CVE-2026-72692 (CVSS 7.5) — A missing authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated …
    CVE-2026-72689 (CVSS 7.5) — A broken object-level authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unau…
    CVE-2026-72688 (CVSS 7.5) — A missing authentication vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated…

    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