# CVE-2026-72846 — lightdash

> As of 2026-08-21, CVE-2026-72846 is a MEDIUM-severity vulnerability in lightdash, CVSS v3.1 6.4, EPSS 0.2% (18.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-72846 as of 2026-08-21; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-21

## What is CVE-2026-72846?

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.

The record classifies CVE-2026-72846 under weakness class [CWE-918](https://intel.threadlinqs.com/cwe/CWE-918). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 46 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 18.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-20, last modified 2026-08-21

## Is CVE-2026-72846 being exploited?

It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **lightdash**: lightdash

## How to fix CVE-2026-72846

No vendor patch reference has been recorded for CVE-2026-72846 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-72846

No threat campaign in the Threadlinqs corpus currently references CVE-2026-72846, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-08-22.

**Vendor advisory and patch**

- [github.com — release notes](https://github.com/lightdash/lightdash/releases/tag/1.146.4)

**Technical analysis**

- [github.com — technical description](https://github.com/lightdash/lightdash/blob/1.146.3/packages/backend/src/clients/GoogleChat/GoogleChatClient.ts)
- [github.com — technical description (MicrosoftTeamsClient)](https://github.com/lightdash/lightdash/blob/1.146.3/packages/backend/src/clients/MicrosoftTeams/MicrosoftTeamsClient.ts)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/lightdash-scheduled-delivery-webhook-urls-are-not-validated-allowing-server-side-request-forgery)

**Issue tracking and product pages**

- [github.com — issue tracking](https://github.com/lightdash/lightdash/issues/24389)
- [github.com — product](https://github.com/lightdash/lightdash)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-72846
Full detection coverage and IOCs for threats exploiting CVE-2026-72846 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp