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Authorization Bypass (IDOR)Weakness · CWE-639

CVE-2026-66058

MEDIUM · 5.3 CVSS v4.0 Published 2026-08-07
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable Zero-click 12 days old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Frappe is a full-stack web application framework. Prior to 16.20.0 and 15.112.0, unrestricted access to a Document Follow API (update_follow) is possible for an authenticated user. This issue is fixed in versions 16.20.0 and 15.112.0.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-639

The application uses a user-supplied identifier to look up a record without checking that the requester actually owns it, so changing the identifier in a request returns someone else's data. This is the classic insecure-direct-object-reference — the change-the-ID-in-the-URL bug. Remediation is authorizing every object access against the acting user, not merely confirming they are logged in.

General guidance for the authorization bypass (idor) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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:X/AU:X/R:X/V:X/RE:X/U:X

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

15.112.0 (for version-15 branch) or 16.20.0 (for version-16 branch)

  1. Backup your Frappe database and application data before upgrading
  2. Identify your current Frappe version using `bench version` or checking the installed packages
  3. If running Frappe version 15.x: upgrade to version 15.112.0 or later (e.g., `bench switch-to-branch version-15` and then `bench update --patch`)
  4. If running Frappe version 16.x: upgrade to version 16.20.0 or later (e.g., `bench switch-to-branch version-16` and then `bench update --patch`)
  5. After upgrading, verify the fix by testing that the document follow API properly enforces authorization checks
  6. Restart the Frappe services (`sudo systemctl restart frappe-bench-web` or `bench restart`)
Caveat Review the Frappe release notes for 15.112.0 and 16.20.0 for any breaking changes specific to your version

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists The vendor has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-66058 in production — separate from our analysis above.

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