CVE-2023-28820 json
Stored cross site scripting in RSS displayer
published 2023-04-28 3 y ago modified 2026-09-10 1 mo ago also GHSA-fgxj-g7x3-85cq , EUVD-2023-1289
- cvss
- 2.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist concrete5/concrete5 9.1.0
- concretecms concrete_cms 9.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 21 mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 2.0 | CVSS:3.1/AC:H/AV:N/A:N/C:L/I:N/PR:H/S:U/UI:R |
| CNA | 3.1 | 2.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 2.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | concrete5/concrete5 | <9.1.0 |
9.1.0 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
concretecms.org
/about/project-news/security/concrete-cms-security-advisory-2023-04-20
web, vendor-advisory
-
github.com
/concretecms/concretecms/releases
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2023-28820
advisory
-
github.com
/concretecms/concretecms
package
Sources
- CVE List CVE-2023-28820
- GitHub Advisory GHSA-fgxj-g7x3-85cq
- NVD CVE-2023-28820
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