What’s Vulnerable › Vulnerabilities

CVE-2026-34586: PdfDing: Shared PDF Expiration, Max Views, and Deletion Bypass via Serve/Download Endpoints

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-863

Description

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.

Affected products

• mrmn2 PdfDing: before 1.7.1 — fixed in 1.7.1

How to fix

Upgrade to a fixed version: mrmn2 PdfDing 1.7.1. Check the vendor advisory for mitigations.

References

• https://github.com/mrmn2/PdfDing/commit/a6783b259b25c839c52c6f2380333827a52e89eb
• https://github.com/mrmn2/PdfDing/releases/tag/v1.7.1
• https://github.com/mrmn2/PdfDing/security/advisories/GHSA-vfqx-2464-38wf

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