An "intruder" proved to be a recipe for anguish for a TVNZ staffer's birthday celebrations – and led to a review of security at the broadcaster.

What was supposed to be a day of celebration apparently turned a bit flat after the employee's cake went missing from the kitchen at the broadcaster's central Auckland headquarters.

A source told the Herald that the cake deserted the building along with a homeless person who had earlier gained entry after following a staff member in via TVNZ's employee entrance on Victoria St West.

Before taking the cake, the person also took a shower in one of the TVNZ bathrooms. They were then able to leave the building unchallenged.

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The source said once the great cake theft was discovered, security checked CCTV footage and discovered the culprit in the sweet-toothed mystery.

A TVNZ spokesperson confirmed there had been a "building intruder late last year".

"Our perimeter security systems have since been strengthened to prevent this happening again. We take our responsibility [to] keep staff, and their cakes, safe very seriously."

Earlier this year, the last 10 minutes of the nightly current affairs show Seven Sharp co-hosted by Jeremy Wells and Hilary Barry went off air after TVNZ HQ had to be evacuated after a fire alarm.

Viewers were instead shown a replay of Kiwi Living during the May 14 incident.

TVNZ confirmed at the time that fire alarms were activated after it appeared an appliance in the tea room had over-heated, generating smoke.

A spokesperson said a review would be carried out so that the network could "take steps to avoid a repeat".

And last year a small electrical fire led to the newsroom being evacuated and 1News' 6pm bulletin delayed for half an hour.

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The fire had started in the building's server room, with nine fire appliances responding to the incident, leading to a road closure.