# CVE-2026-34376: PdfDing: Password-protected share bypass via direct serve endpoint

> Unauthenticated attackers can bypass password protection on shared PDFs by directly accessing the file-serving endpoint, exposing confidential documents.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Apr 2026
- **Updated:** 1 Apr 2026
- **Also known as:** GHSA-42x7-vvj4-4cj3

## What is CVE-2026-34376?

CVE-2026-34376 is a high-severity missing authorization vulnerability in mrmn2 PdfDing, published on 1 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-34376?

It affects 1 product.


Products: Pdfding Pdfding.

## How do I fix CVE-2026-34376?

No fix has been published for CVE-2026-34376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34376 being exploited?

There is no known exploitation of CVE-2026-34376 in the wild and no public exploit code.

## Other vulnerabilities in mrmn2 PdfDing

- [CVE-2026-34586](https://insights.sbomify.com/CVE-2026-34586/): PdfDing: Shared PDF Expiration, Max Views, and Deletion Bypass via Serve/Download Endpoints (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34376 and fix it if it is affected.

What it is: CVE-2026-34376 is a high-severity missing authorization vulnerability in mrmn2 PdfDing, published on 1 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-34376 in the wild and no public exploit code.

Affected product: mrmn2 PdfDing. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-34376/ (Markdown: https://insights.sbomify.com/CVE-2026-34376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34376
- OSV: https://osv.dev/vulnerability/CVE-2026-34376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34376/
Summaries are generated and may contain mistakes; the official description above is the record.