CVE-2023-28820 Stored cross site scripting in RSS displayer
Attackers can inject malicious scripts via unsanitized RSS links, potentially stealing user sessions or executing code in Concrete CMS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2023-28820?
CVE-2023-28820 is a low-severity cross-site scripting vulnerability in Concretecms Concrete Cms, published on 28 Apr 2023. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2023-28820?
2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
concrete5/concrete5 Packagist | All versions | 9.1.0 |
concrete5/concrete5 Packagist | All versions | 9.1.0 |
Products include Concretecms Concrete Cms.
How do I fix CVE-2023-28820?
Upgrade concrete5/concrete5 to 9.1.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2023-28820 being exploited?
There is no known exploitation of CVE-2023-28820 in the wild and no public exploit code.
Other vulnerabilities in Concretecms Concrete Cms
- CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions
- CVE-2022-21829 Code injection in concrete CMS
- CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5
- CVE-2021-40098 Path traversal in n/a
- CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal
Sources
Also known as GHSA-fgxj-g7x3-85cq.