In a note on his official Web site, www.brucespringsteen.net, the New Jersey-born rocker writes that he and Scialfa are still committed to each other.
"Due to the unfounded and ugly rumors that have appeared in the papers over the last few days, I felt they shouldn't pass without comment," he wrote. "Patti and I have been together for 18 years — the best 18 years of my life. We have built a beautiful family we love and want to protect and our commitment to one another remains as strong as the day we were married."
Quoting unnamed sources, the New York Post reported Thursday that Springsteen's and Scialfa's marriage was on the rocks due to his relationship with a Sept. 11 widow he met while organizing a charity event.
Springsteen, 56, and Scialfa, a backup singer in his band, married in 1991 and have three children. He had previously been married to actress Julianne Phillips.
The 53-year-old Scialfa has toured with Springsteen and the E Street Band and has recorded two albums.
A phone message left after hours for Springsteen's publicist was not immediately returned Monday night.