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TI-2026-26833 Aliases CVE-2026-34586

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

Priority MEDIUM 62CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed PdfDing (mrmn2): 1.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mrmn2PdfDingbefore 1.7.11.7.1Patch availableCNA
  • PdfDing Vendormrmn2 Affected before 1.7.1 Fixed in 1.7.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pdfding:pdfding:*:*:*:*:*:*:*:*before 1.7.1VulnerablePdfding
  • cpe:2.3:a:pdfding:pdfding:*:*:*:*:*:*:*:* Versions before 1.7.1 Vulnerable ·Pdfding

Remediation

  • Fix · CNA PdfDing (mrmn2) Fixed in 1.7.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34586

References

Exploit 1

Patch 1

Other 1

  • TI-2026-26662 PdfDing: Password-protected share bypass via direct serve endpoint CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences