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Description

Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via external-link page cvName because updateCollectionAliasExternal bypasses being sanitized. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.

PUBLISHED Reserved 2026-05-07 | Published 2026-05-21 | Updated 2026-05-22 | Assigner ConcreteCMS




LOW: 2.0CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Product status

Default status
unaffected

5.0 (git)
affected

References

documentation.concretecms.org/...n-history/951-release-notes release-notes

cve.org (CVE-2026-8139)

nvd.nist.gov (CVE-2026-8139)

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