# CVE-2026-72918 — RocketChat Rocket.Chat

> As of 2026-08-10, CVE-2026-72918 is a MEDIUM-severity vulnerability in RocketChat Rocket.Chat, CVSS v3.1 5.4, EPSS 0.2% (10.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-72918 as of 2026-08-10; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-10

## What is CVE-2026-72918?

Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 7.10.14, 8.0.8, 8.1.7, 8.2.7, 8.3.7, 8.4.5, 8.5.2, and 8.6.1, the stream-notify-user stream in the WebSocket protocol allows an authenticated user to write arbitrary notification bodies because the sender is not checked, and the client-side UI can create an ephemeral fake message in another user's currently open chat. This issue is fixed in versions 7.10.14, 8.0.8, 8.1.7, 8.2.7, 8.3.7, 8.4.5, 8.5.2, and 8.6.1.

The record classifies CVE-2026-72918 under weakness class [CWE-862](https://intel.threadlinqs.com/cwe/CWE-862). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 56 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.4 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 10.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-10

## Is CVE-2026-72918 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **RocketChat**: Rocket.Chat

## How to fix CVE-2026-72918

No vendor patch reference has been recorded for CVE-2026-72918 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-2026-72918

No threat campaign in the Threadlinqs corpus currently references CVE-2026-72918, 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, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-12. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/RocketChat/Rocket.Chat/security/advisories/GHSA-27jx-236m-3f5j)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-72918
Full detection coverage and IOCs for threats exploiting CVE-2026-72918 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp