# CVE-2026-108555: PairDrop through 1.11.2 IP Spoofing via cf-connecting-ip Header

> Attackers can spoof IP addresses to bypass network restrictions and access private file sharing rooms on self-hosted PairDrop instances.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-4p3m-fhg8-5wfc

## What is CVE-2026-108555?

CVE-2026-108555 is a low-severity authentication bypass vulnerability in schlagmichdoch PairDrop, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

PairDrop through 1.11.2 contains an IP spoofing vulnerability in Peer._setIP that allows remote attackers to join other networks' discovery rooms by supplying a forged cf-connecting-ip header. Attackers who know a victim's public IP can appear as a local device on self-hosted instances not behind Cloudflare to send or receive files.

Weakness: CWE-348 (Use of Less Trusted Source)

## Which versions are affected by CVE-2026-108555?


## How do I fix CVE-2026-108555?

No fix has been published for CVE-2026-108555 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108555 being exploited?

There is no known exploitation of CVE-2026-108555 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108555 and fix it if it is affected.

What it is: CVE-2026-108555 is a low-severity authentication bypass vulnerability in schlagmichdoch PairDrop, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-108555 in the wild and no public exploit code.

Affected product: schlagmichdoch PairDrop. 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-2026-108555/ (Markdown: https://insights.sbomify.com/CVE-2026-108555/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108555
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108555
- OSV: https://osv.dev/vulnerability/CVE-2026-108555

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108555/
Summaries are generated and may contain mistakes; the official description above is the record.