CVE-2023-28821 Missing rate limit for password resets

What is CVE-2023-28821?

CVE-2023-28821 is a medium-severity denial of service vulnerability in Concretecms Concrete Cms, published on 28 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.

Weakness: CWE-640

Which versions are affected by CVE-2023-28821?

2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.

Products include Concretecms Concrete Cms.

How do I fix CVE-2023-28821?

Upgrade concrete5/concrete5 to 9.1.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-28821 being exploited?

There is no known exploitation of CVE-2023-28821 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 Critical 9.8
• CVE-2022-21829 Code injection in concrete CMS Critical 9.8
• CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5 Critical 9.8
• CVE-2021-40098 Path traversal in n/a Critical 9.8
• CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal Critical 9.4

All Concretecms Concrete Cms vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-ph6g-6v8w-8p6m.