Ms. Post, 50, said in an interview on Friday that it was scary to go public, and that the waves of new accusations had been shocking and draining. But it was a comfort, she added, to know she was not alone.

“When women do come forward, it does embolden others,” she said. “It wakes something up in them.”

On Thursday, Vanity Fair reported on the accusations made by Ms. Blair, 45, who is known for her roles in “Cruel Intentions” and “Legally Blonde.” She said that in 1999 Mr. Toback had invited her to his hotel room and convinced her to take off his shirt. Then, she said, he forced her to sit down and rubbed his groin against her leg.

“I tried to look away, but he would hold my face,’’ she told Vanity Fair. “So I was forced to look into his eyes. And I felt disgust and shame.”

Ms. McAdams, 38, who was nominated for an Academy Award for her role in “Spotlight,” told Vanity Fair that Mr. Toback invited her to his hotel room when she was 21, intimidated her and told her that he had masturbated while thinking about her.

Ms. Moore, 56, an Oscar winner who stars in this month’s “Suburbicon,” said on Twitter that Mr. Toback approached her twice during the 1980s. She said that he had invited her to his apartment and then approached her again about a month later using similar language, as though he had forgotten his first attempt.