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Mozilla: Stardust Shares Birth Dates, Contraception Data with RudderStack

7/18/2026

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Summary

Story summary

Mozilla’s July 2026 study found Stardust transmits users’ birth dates, contraceptive methods, and symptom details to RudderStack.
Mozilla tested six period-tracking apps and found Stardust the only one sharing health information with a third party.
Privacy advocates warn the shared reproductive data could be accessed by law-enforcement after the 2022 Supreme Court abortion ruling.

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Story summary

Mozilla’s July 2026 study found Stardust transmits users’ birth dates, contraceptive methods, and symptom details to RudderStack.
Mozilla tested six period-tracking apps and found Stardust the only one sharing health information with a third party.
Privacy advocates warn the shared reproductive data could be accessed by law-enforcement after the 2022 Supreme Court abortion ruling.