POWER OF ATTORNEY

        The undersigned, as a Section 16 reporting person of ForgeRock, Inc.
(the "Company"), hereby constitutes and appoints Sam Fleischmann, Sheri Piazza
and Amy B. Martin as the undersigned's true and lawful attorney-in-fact to:

        1.    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 undersigned's
              ownership, acquisition or disposition of securities of the
              Company; and

        2.    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 attorney-in-fact shall deem
              appropriate.

        The undersigned hereby ratifies and confirms all that said attorney-in-
fact and agents shall do or cause to be done by virtue hereof.  The undersigned
acknowledges that the foregoing attorney-in-fact, in serving in such capacity at
the request of the undersigned, is not assuming, nor is the Company assuming,
any of the undersigned's responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934 (as amended).

        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
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
Company and the foregoing attorney-in-fact.

        IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
be executed as of the date set forth below.

                                        Warren M. Weiss


                                        Signature:     /s/ Warren M. Weiss
                                                   -----------------------------

                                        Date:    September 10, 2021
                                              ----------------------------------