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CVE-2021-21283: XSS in Flarum Sticky extension

medium Affects flarum/sticky. Feed 2026.10.29.4, updated 2026-10-29; published ; advisory modified .

XSS in Flarum Sticky extension

Package
flarum/sticky Composer
Affected versions
>=0.1.0-beta.14 and <0.1.0-beta.15.1
Fixed in
0.1.0-beta.15.1
Severity
medium
Exploitation
not on CISA KEV · EPSS 1% (56.4th percentile)
Published
2021-01-29
Source
osv.dev

References

CWE-79
NVD recordflarum/sticky 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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