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CVE-2021-27909

32
FAUCET Score

CVE-2021-27909 describes a Cross-Site Scripting (XSS) vulnerability in Mautic versions prior to 3.3.4 and 4.0.0, specifically affecting the password reset page. An attacker could exploit this by crafting a malicious password reset URL containing a vulnerable "bundle" parameter, which, if clicked by a target, would execute arbitrary JavaScript code. This vulnerability has a CVSS score of 6.1 (Medium), indicating a network-based attack with low attack complexity, requiring user interaction, and leading to low impact on confidentiality and integrity. While Nuclei templates exist for detecting this flaw, there is no evidence of active exploitation, Metasploit modules, or ExploitDB entries, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.3.4CPE matchmatch criteria
cpe:2.3:a:acquia:mautic:*:*:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:acquia:mautic:4.0.0:alpha1:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:acquia:mautic:4.0.0:beta:*:*:*:*:*:*
4.0.0CPE matchmatch criteria
cpe:2.3:a:acquia:mautic:4.0.0:rc:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.07%
Probability of exploitation in next 30 days
EPSS Percentile
89.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Nuclei: CVE-2021-27909 · Oct 13, 2022
This CVE's current EPSS score of 0.0407 is in the 95th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: mautic/coreFixed in: 3.3.4
composerpatch availablevia ghsa
Product: mautic/coreFixed in: 4.0.0
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-32hw-3pvh-vcvcmedium

XSS vulnerability on password reset page

Sep 1, 2021

References

github.com / mautic/mautic/security/advisories/GHSA-32hw-3pvh-vcvc
PatchThird Party Advisory