This security patch addresses a reported exploit that could affect players with the Steam Overlay disabled. As far as we're aware, the exploit has not been used in the wild. We apologize for any inconvenience caused by the timing of the update releasing shortly before the weekend. (Thanks Jackzebra!)
Edit for v3.26.3.10: shortly afterward, we have released an additional patch to fix another reported potential exploit path. (Thanks euromillions!)