What is the CVSS score of EUVD-2026-17636?

EUVD-2026-17636 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-17636?

Yes, a patch is available for EUVD-2026-17636. Update the affected software to the latest version immediately.

Pdfding EUVD-2026-17636

| CVE-2026-34586 MEDIUM

Incorrect Authorization (CWE-863)

2026-03-31 GitHub_M

Authentication Bypass Pdfding

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

1.7.1

EUVD ID Assigned

Mar 31, 2026 - 21:14 euvd

EUVD-2026-17636

Analysis Generated

Mar 31, 2026 - 21:14 vuln.today

CVE Published

Mar 31, 2026 - 20:27 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

PdfDing is a selfhosted PDF manager, viewer and editor offering a seamless user experience on multiple devices. Prior to version 1.7.1, check_shared_access_allowed() validates only session existence - it does not check SharedPdf.inactive (expiration / max views) or SharedPdf.deleted. The Serve and Download endpoints rely solely on this function, allowing previously-authorized users to access shared PDF content after expiration, view limit, or soft-deletion. This issue has been patched in version 1.7.1.

AnalysisAI

PdfDing prior to version 1.7.1 permits authenticated users to bypass access controls on shared PDF documents by accessing content after expiration, view limits, or soft-deletion due to incomplete validation in the check_shared_access_allowed() function. The Serve and Download endpoints rely solely on session existence checks without verifying SharedPdf.inactive or SharedPdf.deleted flags, allowing previously-authorized users to retrieve sensitive content that should no longer be accessible. This authentication bypass affects all versions before 1.7.1 and requires valid authentication credentials to exploit.

Technical ContextAI

PdfDing implements a shared PDF access control mechanism using a check_shared_access_allowed() function that validates user authorization for downloading or viewing shared documents. The vulnerability stems from incomplete input validation (CWE-863: Incorrect Authorization) where the function only verifies session existence without consulting the SharedPdf object's state flags. Specifically, the SharedPdf.inactive field (which tracks expiration and view count limits) and SharedPdf.deleted flag (soft-delete marker) are not evaluated before granting access. The Serve and Download API endpoints directly rely on this insufficient validation function, creating a window where previously-valid access tokens remain functional despite the underlying shared resource becoming inaccessible through normal channels. This is a classic authorization bypass where authentication (session presence) succeeds, but authorization (checking resource eligibility) fails.

RemediationAI

Vendor-released patch: PdfDing version 1.7.1 and later. Upgrade immediately to version 1.7.1 or newer, which restores proper authorization checks by validating SharedPdf.inactive and SharedPdf.deleted state flags in addition to session presence. The upstream fix is confirmed in commit a6783b259b25c839c52c6f2380333827a52e89eb and released as v1.7.1 at https://github.com/mrmn2/PdfDing/releases/tag/v1.7.1. No workarounds are documented; patching is the primary remediation. If immediate patching is not feasible, restrict access to shared PDF endpoints at the network or reverse-proxy level and audit existing share links to revoke those intended for temporary access.