Yes. You are liable for income tax for both Maryland and California because you were physically working in Maryland while maintaining a permanent residence in California.
Generally, Maryland imposes income tax, and therefore a withholding requirement on employers, for employees living in Maryland and non-residents receiving Maryland-sourced income. Income is deemed Maryland-sourced income when the income is compensation for services performed in Maryland.
See Employer Withholding Requirements For Teleworking Employees During The Covid-19 Emergency
California residents are taxed on worldwide income.
You can use TurboTax Deluxe to file a resident California return and a nonresident Maryland return.
Maryland will ask you to subtract all "non-Maryland" income. Exclude all your California wages plus any other non-compensation. For example, interest and dividends are not taxable to a non-Maryland resident even if you earned it while teleworking in Maryland.
You will owe tax to MD. You can file both returns and wait until you receive you CA refund to pay MD. The MD filing deadline is April 18.
To learn more see How do I file a nonresident state return?
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