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CVE-2021-27910: Stored XSS vulnerability on Bounce Management Callback

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

Stored XSS vulnerability on Bounce Management Callback

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
high  CVSS 8.2
Exploitation
not on CISA KEV · EPSS 1% (53.0th percentile)
Published
2021-09-01
Source
osv.dev

References

CWE-79
NVD recordmautic/core advisories

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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.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

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