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CVE-2026-31859: CraftCMS vulnerable to reflective XSS via incomplete return URL sanitization

medium Affects craftcms/cms. Feed 2026.10.29.3, updated 2026-10-29; published ; advisory modified .

CraftCMS vulnerable to reflective XSS via incomplete return URL sanitization

Package
craftcms/cms Composer
Affected versions
>=4.15.3 and <4.17.3 or >=5.7.5 and <5.9.7
Fixed in
4.17.3, 5.9.7
Severity
medium
Exploitation
not on CISA KEV · EPSS 0% (8.9th percentile)
Published
2026-03-11
Source
osv.dev

References

CWE-116CWE-79
NVD recordcraftcms/cms advisories

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# then
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