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CVE-2026-88893 – Unauthenticated Information Disclosure (Password Hash & Report Exposure) – OpenPane

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Summary

CVE-2026-88893 is an unauthenticated information disclosure vulnerability in OpenPanel, an open-source web and product analytics platform. Three unauthenticated share-lookup procedures fail to enforce access controls, allowing anyone holding a share link to retrieve the argon2id password hash protecting that share as well as the full underlying report, dashboard, or overview definition. The issue is rated High severity (CVSS 8.7) and requires no authentication or user interaction to exploit.

Technical details

  • Root cause: The share.report, share.dashboard, and share.overview procedures query the database with findUnique without restricting selected columns, so the stored argon2id password hash for the share is included in the response. In addition, share.report unconditionally returns the full report definition (event names, filters, breakdown dimensions) even while reporting hasAccess: false, bypassing the public/password gate implemented in sibling procedures.
  • Trigger conditions: An attacker only needs a valid share link/identifier for a dashboard, overview, or report; no session, API key, or share password is required to trigger the disclosure.
  • Attack vector: Network — the flaw is reachable via unauthenticated API/tRPC calls exposed by the OpenPanel backend.
  • Impact: Disclosure of argon2id password hashes (enabling offline password cracking) and exposure of private report/dashboard configurations, which can support further intelligence gathering or unauthorized access to protected shares.

Affected software

  • OpenPanel — all released versions are affected; no patched version was available at the time of public disclosure.

Severity

  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: No official patched version was available at disclosure time. Monitor the OpenPanel project for a fix release and upgrade as soon as one is published.
  • Workarounds (until patched):
    • Treat all existing share-link passwords as compromised and rotate/reset them.
    • Disable or restrict public sharing of dashboards, overviews, and reports where feasible until a fix is available.
    • Restrict network exposure of the OpenPanel API to trusted networks (e.g., VPN, IP allow-listing) to reduce the ability of unauthenticated internet-based attackers to reach share endpoints.
    • Monitor share-endpoint access logs for anomalous or bulk lookup activity indicating enumeration attempts.

References

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