CVE-2026-8139

2.0 lowEPSS 0.1%

Low (2.0) in concretecms concrete cms. EPSS 0.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

2.0 low

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

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.1% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-05-21
Modified: 2026-07-23
Record from: the NVD, synced 2026-10-19

Affected

concretecms:concrete_cms

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

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