CVE-2026-76838Network attack vectorHinoki check available

Authenticated internal response disclosure via webhook redirects

Published Aug 24, 2026 · Updated Aug 29, 2026

Server-side request forgery in Hi.Events before 1.11.1-beta allows remote authenticated users to read internal HTTP responses via webhooks. The dispatch service follows a stored destination without revalidating its resolved address or each redirect, and the webhook log returns the response body. Event or organizer webhook privileges are required; a public hostname can redirect or later resolve to loopback, private-network, or cloud metadata services.

CVSS severity8.4
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Server-side request forgery in Hi.Events before 1.11.1-beta allows remote authenticated users to read internal HTTP responses via webhooks. The dispatch service follows a stored destination without revalidating its resolved address or each redirect, and the webhook log returns the response body. Event or organizer webhook privileges are required; a public hostname can redirect or later resolve to loopback, private-network, or cloud metadata services.

The record

CVE
CVE-2026-76838
Published
Aug 24, 2026
Updated
Aug 29, 2026
Vendor
Hi.Events
Product
Hi.Events
Classifications
CWE-918, CAPEC-664, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.11.1-beta

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Hi.Events · Hi.Eventsversion=0 <1.11.1-beta

Published CVSS scores

8.4VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
8.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1552.005Cloud Instance Metadata API

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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