Auth bypass in Mrmn2 Pdfding
CVE-2026-34376
PdfDing is a selfhosted PDF manager, viewer and editor offering a seamless user experience on multiple devices. Prior to version 1.7.0, an access-control vulnerability allows unauthenticated users to retrieve password-protected shared PDFs by directly calling the file-serving endpoint without completing the password verification flow. This results in unauthorized access to confidential documents that users expected to be protected by a shared-link password. This issue has been patched in version 1.7.0.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Mrmn2 Pdfding — versions < 1.7.0
- Pdfding
Weakness classification (CWE)
References
- github.com/mrmn2/PdfDing/security/advisories/GHSA-42x7-vvj4-4cj3 (Vendor Advisory)
- github.com/mrmn2/PdfDing/pull/294 (Patch, Issue Tracking)
- github.com/mrmn2/PdfDing/commit/ae579ea98c5603d1435e0d90e81d72151564088a (Patch)
- github.com/mrmn2/PdfDing/releases/tag/v1.7.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34376?
- CVE-2026-34376 is a high-severity vulnerability in Mrmn2 Pdfding, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-04-01.
- How severe is CVE-2026-34376?
- High severity. CVSS v3 base score is 7.5 out of 10.