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CVE-2026-25741— Zulip Vulnerable to Modification of Payment Method (Stripe Default Card) by Non-Billing Users

Quick assessment

Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip存在安全漏洞，该漏洞源于API端点缺少账单特定授权检查，可能导致普通成员更改组织的支付方式。

CVSS 7.1 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1098.004 · SSH Authorized Keys
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I. Basic Information for CVE-2026-25741

Vulnerability Information
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Vulnerability Title
Zulip Vulnerable to Modification of Payment Method (Stripe Default Card) by Non-Billing Users
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是美国Zulip公司的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip存在安全漏洞，该漏洞源于API端点缺少账单特定授权检查，可能导致普通成员更改组织的支付方式。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zulip zulip < bf28c82dc9b1f630fa8e9106358771b20a0040f7 -

II. Public POCs for CVE-2026-25741

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III. Intelligence Information for CVE-2026-25741

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IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-863

V. Comments for CVE-2026-25741

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