Vulnerability · Published Sep 30, 2026 · Assigned by VulnCheck

CVE-2026-103397OpenSave before 2.4.0-beta.1 Authentication Bypass via Spoofed Relay Sender

Medium 5.6

In plain English

A medium-severity authentication bypass by spoofing in OpenSave from Liquid-co. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)5.6Medium

Exploit odds (30 days)0.2%top 87.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

OpenSave before 2.4.0-beta.1 fails to validate sender identity in WAN relay requests, allowing unpaired room members to impersonate paired devices by spoofing the RelayMessage From field. Attackers who know the room code can join, read paired peer identifiers from announcements, and send forged requests to access protected sync routes including save data, snapshots, and file operations.

Affected products (as reported)

Vendor	Product	Versions
Liquid-co	OpenSave	0 – before 2.4.0-beta.1

Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References

https://gist.github.com/mansurmavlankulov/2ca66f95965fb9d4aab353bcf2434cdb third-party-advisory
Patch Commit patch
https://github.com/Liquid-co/OpenSave/blob/v2.3.1/internal/p2p/wanclient_handlers.go#L268-L282 technical-description
https://github.com/Liquid-co/OpenSave product
VulnCheck Advisory: OpenSave before 2.4.0-beta.1 Authentication Bypass via Spoofed Relay Sender third-party-advisory