XSS vulnerability on asset view

published 2021-08-30 5 y ago modified 2026-07-08 4 mo ago also GHSA-rh5w-82wh-jhr8 , EUVD-2021-2108

cvss: 7.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

Mautic versions before 3.3.4/4.0.0 are vulnerable to an inline JS XSS attack when viewing Mautic assets by utilizing inline JS in the title and adding a broken image URL as a remote asset. This can only be leveraged by an authenticated user with permission to create or edit assets.

Patch / fix

fixed in 2 links 1

packagist mautic/core 3.3.4, 4.0.0
Mautic Mautic 3.3.4, 4.0.0

github.com/mautic/mautic/security/advisories/GHSA-rh5w-82wh-jhr8 advisory

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub	3.1	7.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	mautic/core	<3.3.4 >=4.0.0-alpha1, <4.0.0	3.3.4 4.0.0

Affected products

Mautic Mautic

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /mautic/mautic/security/advisories/GHSA-rh5w-82wh-jhr8
web, patch, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-27912
advisory
github.com /FriendsOfPHP/security-advisories/blob/master/mautic/core/CVE-2021-27912.yaml
web
github.com /mautic/mautic
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary