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7.1
Zulip: Non-admin users can change organization payment method
CVE-2026-25741
Summary
A security issue allowed non-admin users to change an organization's default payment method. This is a concern because it could lead to unexpected charges or billing issues. Self-hosted Zulip deployments are not affected and do not need to take any action.
Original title
Zulip is an open-source team collaboration tool. Prior to commit bf28c82dc9b1f630fa8e9106358771b20a0040f7, the API endpoint for creating a card update session during an upgrade flow was accessible ...
Original description
Zulip is an open-source team collaboration tool. Prior to commit bf28c82dc9b1f630fa8e9106358771b20a0040f7, the API endpoint for creating a card update session during an upgrade flow was accessible to users with only organization member privileges. When the associated Stripe Checkout session is completed, the Stripe webhook updates the organization’s default payment method. Because no billing-specific authorization check is enforced, a regular (non-billing) member can change the organization’s payment method. This vulnerability affected the Zulip Cloud payment processing system, and has been patched as of commit bf28c82dc9b1f630fa8e9106358771b20a0040f7. Self-hosted deploys are no longer affected and no patch or upgrade is required for them.
nvd CVSS3.1
7.1
Vulnerability type
CWE-863
Incorrect Authorization
Published: 26 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026