Pau moved up to ninth position in the standings as they shocked Top 14 heavyweights Toulouse 9-6 in a try-less match at Stade Du Hameau.
Sitting bottom before kick-off, these four points see the newly-promoted side go above Agen, Stade Français, La Rochelle, Oyonnax and Bordeaux-Bègles.
Toulouse meanwhile had their 100 percent record ended in disappointing style as they could not break the Pau defensive line and must settle for the one point.
After a scoreless 32 minutes, Pau finally broke the deadlock with a penalty from scrum-half Samuel Marquez which was how it stayed until the half-time break.
Half-back partner and Argentina international Santiago Fernandez landed a drop-goal to double their advantage in front of their supporters on 45 minutes.
And the lead would grow on the hour mark thanks to Marquez's second penalty before Toby Flood responded with two penalties to set up a nervy finish for Pau with twelve minutes remaining. However, they held on for a shock triumph.
Pen: Marques 2
Yellow: King (36 mins), Vunibaka (37 mins)
Pen: Flood 2
Yellow: Gray (71 mins), Lamboley (75 mins)
Pau: 15 Damien Traille, 14 Marika Vunibaka, 13 Julien Fumat, 12 Vincent Campo, 11 Mosese Ratuvou, 10 Santiago Fernandez, 9 Samuel Marques, 8 James Coughlan, 7 Jean Bouilhou, 6 Sean Dougall, 5 Jovili Domolailai, 4 Julien Pierre, 3 Chris King, 2 Thomas Bianchin, 1 Julien Jacquot.
Replacements: 16 Mehdi Boundjema, 17 Jeremy Hurou, 18 Damien Fevre, 19 Paddy Butler, 20 Brice Monzeglio, 21 Thierry Lacrampe, 22 Charly Malie, 23 Sylvain Charlet.
Toulouse: 15 Maxime Medard, 14 Vincent Clerc, 13 Yann David, 12 Toby Flood, 11 Arthur Bonneval, 10 Jean-Marc Doussain, 9 Sebastien Bezy, 8 Imanol Harinordoquy, 7 Talalelei Gray, 6 Yacouba Camara, 5 Patricio Albacete, 4 Gregory Lamboley, 3 Census Johnston, 2 Corey Flynn, 1 Vasil Kakovin.
Replacements: 16 Julien Marchand, 17 Gurthro Steenkamp, 18 Romain Millo-Chluski, 19 Gillian Galan, 20 Tomas Leonardi, 21 David Mele, 22 Clement Poitrenaud, 23 Dorian Aldegheri.
Referee: Adrien Descottes
Assistant referees: Vivien Praderie, Jacques De Lemos
Television match official: Jean-Marie Piraveau