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.
- 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
- None listed
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
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.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-108555 being exploited?
There is no known exploitation of CVE-2026-108555 in the wild and no public exploit code.
Sources
Also known as GHSA-4p3m-fhg8-5wfc.