Threats affecting pkg:github/Hi.Events

CVE-2026-76838 is a Server-Side Request Forgery (SSRF) vulnerability in HiEventsDev's Hi.Events product. The vulnerability arises because webhook destination URLs are only validated at registration, not at dispatch. The validation uses gethostbyname() to reject private and reserved IP ranges, but this check can be bypassed by redirects to internal addresses or by changing DNS records after registration. The server follows redirects by default and returns the internal response body to the requester, exposing potentially sensitive internal services. Version 1.11.1-beta addresses these issues by revalidating URLs at dispatch, pinning validated addresses, checking each redirect hop, and decoding IPv6 transition addresses to prevent bypasses.

Hi.Events before 1.11.0 contains a cross-site scripting vulnerability that allows authenticated attackers with event creation or edit permissions to inject arbitrary HTML and JavaScript by embedding a malicious event title containing the </script> sequence, which is not escaped by JSON.stringify() when embedded in inline script tags. Attackers can craft an event title that breaks out of the script context in the application/ld+json structured data block or server-side rehydrated state, causing the payload to execute in the browser of any user who views the public event page, including unauthenticated visitors and authenticated administrators.

Hi.Events before 1.11.0 contains a missing server-side visibility enforcement vulnerability that allows unauthenticated attackers to purchase hidden tickets by referencing hidden product and price IDs in order creation requests without authorization checks. Attackers can enumerate sequential hidden ticket IDs from visible ones and submit order creation requests referencing those IDs to purchase VIP, invite-only, or discounted tickets intentionally withheld from public sale.

Hi.Events through 1.9.0 public check-in list endpoints use short_id as sole access control, allowing unauthenticated access to retrieve full attendee lists including emails and personal information. Attackers with knowledge of the short_id can call GET /api/public/check-in-lists/{short_id}/attendees to read attendee data and create or delete check-in records without authentication.

Hi.Events through 1.9.0 contains a promo code validation vulnerability where reservation validates usage count before asynchronous UpdateEventStatisticsJob increments it, allowing attackers to redeem limited promo codes unlimited times. Attackers can sequentially reserve multiple orders with the same restricted promo code, each reading order_usage_count=0 and passing validation, then complete them all at discounted prices without concurrent requests.