CVE-2026-25741 Zulip Vulnerable to Modification of Payment Method (Stripe Default Card) by Non-Billing Users
Non-billing users can modify the organization's default payment method due to missing authorization checks in the upgrade flow API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-25741?
CVE-2026-25741 is a high-severity missing authorization vulnerability in zulip, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-25741?
How do I fix CVE-2026-25741?
No fix has been published for CVE-2026-25741 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-25741 being exploited?
There is no known exploitation of CVE-2026-25741 in the wild and no public exploit code.
Sources
Also known as GHSA-vhhx-84f7-rc8j.