CVE-2021-27909: XSS vulnerability on password reset page

medium Affects mautic/core. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

XSS vulnerability on password reset page

Package
mautic/core Composer
Affected versions
<3.3.4 or >=4.0.0-alpha1 and <4.0.0 or <4.0.0 or >=3.3.0 and <3.3.4 or >=3.2.0 and <3.3.0 or >=3.1.0 and <3.2.0 or >=3.0.0 and <3.1.0
Fixed in
4.0.0
Severity
medium  CVSS 6.3
Exploitation
not on CISA KEV · EPSS 4% (90.6th percentile)
Published
2021-09-01
Source
osv.dev

References

CWE-79
NVD recordmautic/core advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs   How findings are ranked

Related advisories