Stored cross site scripting in RSS displayer

MEDIUM 5.4CVE-2023-28820 · GHSA-fgxj-g7x3-85cq · Published 28/04/2023 · updated 17/06/2026

In short

CVE-2023-28820 is a MEDIUM (CVSS 5.4) vulnerability affecting concrete5/concrete5, concrete cms (concretecms).
Chance of exploitation in the next 30 days (EPSS): 0.39%, higher than 33.5% of all vulnerabilities.
Fix: update to 9.1.0 or later.

Package	Affected versions	Patched versions
concrete5/concrete5 Packagist	`< 9.1.0`	`9.1.0`
concrete cms concretecms	`< 9.1.0`	`9.1.0`

Description

Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.

NVD description

Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.

References

nvd.nist.gov/vuln/detail/CVE-2023-28820 · ADVISORY
concretecms/concretecms · PACKAGE
concretecms/concretecms release · WEB
concretecms.org/about/project-news/security/concrete-cms-security-advisory-2023-04-20 · WEB

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Package

Affected versions

Patched versions

concrete5/concrete5

Packagist

< 9.1.0

9.1.0

concrete cms

concretecms

< 9.1.0

9.1.0

Description

Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.

NVD description

Concrete CMS (previously concrete5) before 9.1 is vulnerable to stored XSS in RSS Displayer via the href attribute because the link element input was not sanitized.

More vulnerabilities in concrete5/concrete5

See all →