Vulnerability · Published Oct 30, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity missing authentication in serpbear from towfiqi. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.6%top 49.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
towfiqi	serpbear	0 – before 3.1.1

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

GitHub Issue #359 issue-tracking
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
serpbear v3.1.1 Release Notes release-notes
VulnCheck Advisory: SerpBear before 3.1.1 Missing Authentication via POST /api/notify third-party-advisory