Vulnerability · Published Oct 10, 2026 · Assigned by VulnCheck
CVE-2026-108555PairDrop through 1.11.2 IP Spoofing via cf-connecting-ip Header
Medium 4.2
In plain English
A medium-severity security flaw in PairDrop from schlagmichdoch. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.1%top 97.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| schlagmichdoch | PairDrop | 0 – through 1.11.2 |
Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- GitHub Issue #510 issue-tracking
- https://github.com/schlagmichdoch/PairDrop product
- https://github.com/schlagmichdoch/PairDrop/blob/4862ba3067be1a0f2e0d1e94861dc9200b5bfeea/server/peer.js#L44-L54 technical-description
- https://github.com/schlagmichdoch/PairDrop/blob/4862ba3067be1a0f2e0d1e94861dc9200b5bfeea/server/ws-server.js#L312-L314 technical-description
- VulnCheck Advisory: PairDrop through 1.11.2 IP Spoofing via cf-connecting-ip Header third-party-advisory