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CVE-2026-76838— Hi.Events before 1.11.1-beta Server-Side Request Forgery via Unvalidated Webhook Redirects

Quick assessment

Affected
HiEventsDev Hi.Events
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.

以下是该漏洞描述信息的中文翻译： Hi.Events 仅在注册 Webhook 目标时对其进行验证，而在实际使用时不再进行验证。后端代码中 文件中的 规则通过 解析主机名，并拒绝私有范围和保留地址范围；由于所有公共主机名均能通过此检查，因此该验证机制存在缺陷。 在事件触发阶段， 会读取已存储的 URL，并通过 发起请求，且不再重复执行任何安全检查。此外， 配置文件未设置任何 Guzzle HTTP 客户端选项，因此默认保持重定向跟随功能开启。 若某个 Webhook 目标返回一个重定向至回环地址（loopback）

CVSS 8.5 · High EPSS 0.31% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
HiEventsDev Hi.Events < 1.11.1-beta affected
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I. Basic Information for CVE-2026-76838

Vulnerability Information
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Vulnerability Title
Hi.Events before 1.11.1-beta Server-Side Request Forgery via Unvalidated Webhook Redirects
Source: CVE Program / CVE List V5
Vulnerability Description
Hi.Events validates a webhook destination only when it is registered, never when it is used. NoInternalUrlRule in backend/app/Validators/Rules/NoInternalUrlRule.php resolves the hostname with gethostbyname() and rejects private and reserved ranges, which any public hostname passes. At dispatch, WebhookDispatchService takes the stored URL and calls it through spatie/laravel-webhook-server without repeating the check, and backend/config/webhook-server.php sets no Guzzle options, so redirect following remains enabled by default. A destination that answers with a redirect to a loopback, private or cloud metadata address therefore causes the server to issue that request, and changing the hostname's DNS record after registration reaches the same result because no resolution is repeated. The response is not discarded: WebhookResponseHandlerService stores the body on the webhook log and WebhookLogResource returns it from the webhook logs endpoint, so the requester reads what the internal service replied rather than inferring it. Both event and organizer webhooks share the rule and the dispatch path. Version 1.11.1-beta revalidates at dispatch, pins the validated address, checks every redirect hop, and decodes IPv6 transition addresses that previously bypassed the filter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HiEventsDev Hi.Events 0 ~ 1.11.1-beta -

II. Public POCs for CVE-2026-76838

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9164 chars
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III. Intelligence Information for CVE-2026-76838

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Patches & Fixes for CVE-2026-76838 (1)

Vendor Advisories for CVE-2026-76838 (1)

Vendor Pages for CVE-2026-76838 (1)

Other References for CVE-2026-76838 (1)

IV. Related Vulnerabilities

Same product: Hi.Events
Same vendor: HiEventsDev
Same weakness: CWE-918

V. Comments for CVE-2026-76838

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