CVE-2026-103397

MEDIUM 5.6

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

CVSS Score

5.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-290
Vendor	liquid-co
Product	opensave
Published	Sep 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

Liquid-co / OpenSave

0 < 2.4.0-beta.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

gist.github.com: https://gist.github.com/mansurmavlankulov/2ca66f95965fb9d4aab353bcf2434cdb github.com: https://github.com/Liquid-co/OpenSave/commit/2f2612b13233ac123e01a03cb3008c44bacaeae3 github.com: https://github.com/Liquid-co/OpenSave/blob/v2.3.1/internal/p2p/wanclient_handlers.go#L268-L282 github.com: https://github.com/Liquid-co/OpenSave vulncheck.com: https://www.vulncheck.com/advisories/opensave-before-2.4.0-beta.1-authentication-bypass-via-spoofed-relay-sender

Credits

mansurmavlankulov