POWER OF ATTORNEY The undersigned, as a Section 16 reporting person of Zscaler, Inc. (the “Company”), hereby constitutes and appoints Remo Canessa, Robert Schlossman, Torrie Nute, James Reilly, and Lianna Whittleton, and each of them, as the true and lawful attorney-in-fact of the undersigned to: 1. prepare, execute in the name of the undersigned and on behalf of the undersigned, and submit to the Securities and Exchange Commission (the “SEC”) a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain EDGAR codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or regulation of the SEC; 2. complete and execute Forms 3, 4 and 5 and other forms and all amendments thereto as such attorney-in-fact shall in his discretion determine to be required or advisable pursuant to Section 16 of the Securities Exchange Act of 1934 (as amended) and the rules and regulations promulgated thereunder, or any successor laws and regulations, as a consequence of the ownership, acquisition or disposition of securities of the Company by the undersigned; and 3. do all acts necessary in order to file such forms with the SEC, any securities exchange or national association, the Company and such other person or agency as the attorneys-in-fact shall deem appropriate. The undersigned hereby ratifies and confirms all that said attorneys-in-fact and agents shall do or cause to be done by virtue hereof. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the responsibilities to comply with Section 16 of the Securities Exchange Act of 1934 (as amended) by the undersigned. This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the holdings of and transactions in securities issued by the Company of the undersigned, unless earlier revoked by the undersigned in a signed writing delivered to the Company and the foregoing attorneys-in-fact. IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 6th day of October 2024. Signature: /s/Adam Geller Print Name: Adam Geller

 
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