EUVD-2026-65010
GHSA-j9wc-mrp3-532h
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable via webhook trigger; low-privilege auth required; scope changes because server is induced to access other internal systems; high confidentiality impact from response exfiltration; low integrity impact from potential internal side-effects.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-side request forgery in Hi.Events (all versions prior to 1.11.1-beta) allows an authenticated platform user to exfiltrate responses from internal network services, including cloud metadata endpoints, by exploiting a time-of-check/time-of-use gap in webhook URL validation. The registration-time guard in NoInternalUrlRule is never repeated at dispatch, and Guzzle's default redirect-following allows a destination that answers with a redirect to a loopback or RFC-1918 address to cause the server to issue the secondary request. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid Hi.Events platform account with permission to register webhooks - the CVSS PR:L metric confirms a low-privilege authenticated session is sufficient; unauthenticated access is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N correctly captures the threat profile: the attack is network-reachable, requires no special conditions beyond a low-privilege account, and produces high confidentiality impact on both the vulnerable system and subsequent systems such as cloud metadata services. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated Hi.Events organizer registers a webhook pointing to a domain they control (e.g., attacker.example.com), which resolves to a legitimate public IP at registration time, passing the NoInternalUrlRule check. Before the next event trigger fires the webhook, the attacker reconfigures attacker.example.com to respond with an HTTP 301 redirect to http://169.254.169.254/latest/meta-data/iam/security-credentials/role-name. … |
| Remediation | Upgrade to Hi.Events 1.11.1-beta, which resolves the vulnerability by revalidating the webhook URL at every dispatch invocation, pinning the IP address resolved at registration time, inspecting every redirect hop against the private-range blocklist, and normalizing IPv6 transition addresses before comparison. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Hi.Events deployments, identify all active platform users, and review webhook access logs for suspicious activity. …
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External POC / Exploit Code
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