Detections
Analytics

SCA: security update for unleash-server (GHSA-w4mq-xh27-6xpx)

medium Tenable Self-Hosted Container Security Plugin ID 446231

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Unleash is an open-source feature management platform. Prior to 8.0.3, FeatureEventFormatterMd.format in
 src/lib/addons/feature-event-formatter-md.ts assigns Mustache.escape to an identity function before
 rendering action and path templates. Because Mustache.escape is process-wide, the assignment disables
 escaping for subsequent Mustache.render calls in email-service.ts, webhook.ts, datadog.ts, and new-
 relic.ts. An editor-level user can place Slack or Microsoft Teams link syntax in an unrestricted username,
 trigger a feature event, and inject an attacker-labeled link into a trusted outbound notification channel,
 while other Mustache sinks remain unescaped until restart. This issue is fixed in version 8.0.3.
 (CVE-2026-63466)

Solution

Update the unleash-server library and its related packages to version 8.0.3 or later.

See Also

https://github.com/advisories/GHSA-w4mq-xh27-6xpx

Plugin Details

Severity: Medium

ID: 446231

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/22/2026

Updated: 8/22/2026

Risk Information

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2026-63466

CVSS v3

Risk Factor: Medium

Base Score: 4.1

Temporal Score: 3.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/21/2026

Vulnerability Publication Date: 8/21/2026

Reference Information

CVE: CVE-2026-63466

cwe: CWE-116