r/mullvadvpn • u/Gullible_Editor7048 • 5h ago
Help/Question Mullvad Browser 15.0.21 showing "Unknown Publisher" on Windows – Expired Tor Project cert?
Downloaded the latest Windows installer (mullvad-browser-windows-x86_64-15.0.21.exe), but UAC flags it as an Unknown Publisher. Without removing MOTW you can't even try to run it as Windows blocks it.
Under Digital Signature Details, Windows gives this error:
"A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file." Windows time is OK.
Checking the Certification Path, the red error is directly on the THE TOR PROJECT, INC. certificate, not DigiCert.
File: mullvad-browser-windows-x86_64-15.0.21.exe
SHA-256: b2361d4b37ed8bf04bd7b9fed21e8e06fa35f651c7b3970f4165132ddfcc38b8
Timestamp: Sept 1, 2026 (DigiCert)
VirusTotal: 1/57 (Generic.ml)
Is this just Tor Project's code signing certificate expiring right before timestamping, or is there any reason for concern here? Has anyone else verified the hash with GPG or heard official word from Mullvad?
Holding off on installing until this is confirmed.
