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CVE-2025-31478— Zulip Authentication Backend Configuration Bypass

Quick assessment

Affected
zulip zulip
Exploitation
Public or AI PoC available; prioritize validation
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 10.2之前版本存在授权问题漏洞，该漏洞源于单点登录配置错误，可能导致未授权账户创建。

CVSS 8.2 · High EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account
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I. Basic Information for CVE-2025-31478

Vulnerability Information
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Vulnerability Title
Zulip Authentication Backend Configuration Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Zulip is an open-source team collaboration tool. Zulip supports a configuration where account creation is limited solely by being able to authenticate with a single-sign on authentication backend, meaning the organization places no restrictions on email address domains or invitations being required to join, but has disabled the EmailAuthBackend that is used for email/password authentication. A bug in the Zulip server means that it is possible to create an account in such organizations, without having an account with the configured SSO authentication backend. This issue is patched in version 10.2. A workaround includes requiring invitations to join the organization prevents the vulnerability from being accessed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 授权问题漏洞
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 10.2之前版本存在授权问题漏洞，该漏洞源于单点登录配置错误，可能导致未授权账户创建。
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 < 10.2 -

II. Public POCs for CVE-2025-31478

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7966 chars
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III. Intelligence Information for CVE-2025-31478

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Vendor Advisories for CVE-2025-31478 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-287

V. Comments for CVE-2025-31478

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