CVE-2026-119705— SerpBear before 3.1.1 Missing Authentication via POST /api/notify

Quick assessment

Affected

towfiqi serpbear

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.

SerpBear 3.1.1 之前的版本在文件中存在身份验证缺失漏洞，允许未经认证的远程攻击者触发通知邮件，原因是函数从未被调用。攻击者可以反复向接口发送 POST 请求（可选地携带 domain 参数），从而耗尽 SMTP 速率限制、触发邮件服务提供商的滥用标记，并向收件人发送大量邮件进行洪水攻击。

CVSS 5.3 · Medium Updated Oct 30, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

SerpBear before 3.1.1 Missing Authentication via POST /api/notify

Source: CVE Program / CVE List V5

Vulnerability Description

SerpBear before 3.1.1 contains a missing authentication vulnerability in pages/api/notify.ts that allows remote unauthenticated attackers to trigger notification emails because verifyUser() is never called. Attackers can repeatedly POST to /api/notify, optionally with a domain parameter, to exhaust SMTP rate limits, trigger provider abuse flags and flood recipients.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

关键功能的认证机制缺失

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
towfiqi	serpbear	0 ~ 3.1.1	-

II. Public POCs for CVE-2026-119705

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-119705

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Other References for CVE-2026-119705 (6)

https://github.com/towfiqi/serpbear product
https://github.com/towfiqi/serpbear/commit/12dc0a4bd91f06de2dab96f797c495942f7ef8c9 patch
https://github.com/towfiqi/serpbear/blob/v3.1.0/pages/api/notify.ts#L16-L21 technical-description
https://github.com/towfiqi/serpbear/issues/359 issue-tracking
https://github.com/towfiqi/serpbear/releases/tag/v3.1.1 release-notes
https://www.vulncheck.com/advisories/serpbear-before-3.1.1-missing-authentication-via-post-api-notify third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-119705

IV. Related Vulnerabilities

Same weakness: CWE-306