Code of Civil Procedure section 428.10

A party against whom a cause of action has been asserted in a complaint or cross-complaint may file a cross-complaint setting forth either or both of the following:

(a)

Any cause of action he has against any of the parties who filed the complaint or cross-complaint against him. Nothing in this subdivision authorizes the filing of a cross-complaint against the plaintiff in an action commenced under Title 7 (commencing with Section 1230.010) of Part 3.

(b)

Any cause of action he has against a person alleged to be liable thereon, whether or not such person is already a party to the action, if the cause of action asserted in his cross-complaint (1)arises out of the same transaction, occurrence, or series of transactions or occurrences as the cause brought against him or (2)asserts a claim, right, or interest in the property or controversy which is the subject of the cause brought against him.

Source: Section 428.10, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=CCP§ionNum=428.­10.­ (updated Jan. 1, 1975; accessed Dec. 29, 2025).

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Verified:
Dec. 29, 2025

§ 428.10's source at ca​.gov