1. Yes, a Sorcerer can use the scroll with a caster level check. As Per Core rulebook: If the user meets all the requirements noted above, and her caster level is at least equal to the spell’s caster level, she can automatically activate the spell without a check. If she meets all three requirements but her own caster level is lower than the scroll spell’s caster level, then she has to make a caster level check (DC = scroll’s caster level + 1) to cast the spell successfully. If she fails, she must make a DC 5 Wisdom check to avoid a mishap (see Scroll Mishaps). A natural roll of 1 always fails, whatever the modifiers. If the caster level check fails but no mishap occurs, the scroll is not expended. Activating a scroll is a standard action (or the spell’s casting time, whichever is longer) and it provokes attacks of opportunity exactly as casting a spell does.
2. A Sorcerer casting a spell that is on the Sorcerer spell list would use Cha.
2. The rogue has to Decipher the scroll first. Then,as per the Core rulebook in the UMD section: (Emulate an Ability Score: To cast a spell from a scroll, you need a high score in the appropriate ability (Intelligence for wizard spells, Wisdom for divine spells, or Charisma for sorcerer or bard spells). Your effective ability score (appropriate to the class you’re emulating when you try to cast the spell from the scroll) is your Use Magic Device check result minus 15. If you already have a high enough score in the appropriate ability, you don’t need to make this check.) so said rogue could use either Int or Cha.
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