Hezbollah leader Hassan Nasrallah in rare public appearance. Reuters

Report: Mossad Agent Infiltrated Hezbollah's Upper Echelons -- Arutz Sheva

Mossad 'cell' reportedly managed to thwart a significant number of major plots against Israeli targets; agent was dept. head of foreign ops.

Hezbollah says it recently exposed a Mossad agent embedded among its "elite operations unit", in what the Iranian-backed terror group says is "the most serious [intelligence] breach in Hezbollah's history."

According to Lebanese media reports, "sources close to Hezbollah" claimed an Israeli intelligence cell - comprised of four Hezbollah members under the command of the Mossad agent - had managed to foil a number of attempts by the Shia Islamist group to carry out attacks in revenge for the assassination of its most senior military chief, Imad Mughniyeh, back in 2008.

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More News On Reports That Hezbollah Has Arrested An Israeli Mole In It's Organization

Report: Hezbollah catches Mossad spy working as key official in its ranks -- Jerusalem Post
Super-Mole Discovered Working in Upper Ranks of Hezbollah on Behalf of Israeli Mossad -- Washington Free Beacon
'Mossad spy' headed Hezbollah's foreign operations -- YNet News
Israeli spy allegedly infiltrated Hezbollah and passed information on terrorist group to Mossad -- National Post/Washington Post
Report names alleged Mossad spy in Hezbollah’s ranks -- Times of Israel
Report: Mossad spy that infiltrated Hezbollah was in charge of Nasrallah's security -- Jerusalem Post
Alleged Hezbollah Mossad spy ‘was Nasrallah bodyguard’ -- Times of Israel
Lebanon: Mossad double agent 'infiltrated Hezbollah' to be bodyguard of leader Hassan Nasrallah -- IBTimes
Report: Hezbollah tries Mossad informant who foiled 5 attacks against Israelis -- Jerusalem Post
Hezbollah Places 'Mossad Agent' on Trial for Treason -- Arutz Sheva
Hezbollah Scatters Overseas Terror Cells After Alleged Capture of Mossad Double Agent: Report -- Algemeiner

My Comment: If I was the leader of Hezbollah, I will now have to make the assumption that everything has been compromised, and Israel is aware of everything.