I understand that sexual intercourse with a woman during her menstruation is forbidden. But how about giving a woman in that state orgasm by stimulating her through masturbation. Would that be permissible?
In the name of Allāh, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-raḥmatullāhi wa-barakātuh.
It is not permissible for a man to touch any part of his wife from the navel to the knees during her menses. Hence stimulating her through masturbation will fall under the same ruling.
And Allah Ta‘ala knows best
Mufti Luqman Hansrot
 (Bahisti Zewar, Zam Zam Publishers, Vol 1, Page 92)