Auth bypass in Mrmn2 Pdfding
CVE-2026-34586
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Mrmn2 Pdfding — versions < 1.7.1
- Pdfding
Weakness classification (CWE)
References
- github.com/mrmn2/PdfDing/security/advisories/GHSA-vfqx-2464-38wf (Exploit, Mitigation, Vendor Advisory)
- github.com/mrmn2/PdfDing/commit/a6783b259b25c839c52c6f2380333827a52e89eb (Patch)
- github.com/mrmn2/PdfDing/releases/tag/v1.7.1 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34586?
- CVE-2026-34586 is a medium-severity vulnerability in Mrmn2 Pdfding, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2026-03-31.
- How severe is CVE-2026-34586?
- Medium severity. CVSS v3 base score is 6.5 out of 10.