Authorization Flaw in Zulip Payment Processing by Zulip
CVE-2026-25741

7.1HIGH

Key Information:

Vendor

Zulip

Status
Zulip
Vendor
CVE Published:
26 February 2026

What is CVE-2026-25741?

Zulip, an open-source team collaboration tool, experienced an authorization flaw in its Cloud payment processing system. Specifically, before the fix implemented in commit bf28c82dc9b1f630fa8e9106358771b20a0040f7, the API endpoint responsible for creating a card update session during the upgrade flow could be accessed by users with only organization member privileges. This oversight allowed standard members, lacking billing-specific authorization, to modify the organization’s payment method upon completion of the associated Stripe Checkout session. Following the patch, self-hosted deployments are no longer vulnerable, while the Cloud version has been secured.

Affected Version(s)

zulip < bf28c82dc9b1f630fa8e9106358771b20a0040f7

References

https://github.com/zulip/zulip/security/advisories/GHSA-v...
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https://github.com/zulip/zulip/commit/bf28c82dc9b1f630fa8...
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CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.