CVE-2026-25741
Zulip Vulnerable to Modification of Payment Method (Stripe Default Card) by Non-Billing Users
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.
| CWE | CWE-863 |
| Vendor | zulip |
| Product | zulip |
| Published | Feb 26, 2026 |
| Last Updated | Mar 3, 2026 |
Get instant alerts for zulip zulip
Be the first to know when new high vulnerabilities affecting zulip zulip are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L