VDB-227683 · CVE-2023-28821 · EUVD-2023-1366

Concrete CMS up to 9.0 password recovery

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Concrete CMS up to 9.0. Impacted is an unknown function. This manipulation causes password recovery. This vulnerability appears as CVE-2023-28821. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Concrete CMS up to 9.0 (Content Management System). Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a password recovery vulnerability. The CWE definition for the vulnerability is CWE-640. The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak. As an impact it is known to affect confidentiality. The summary by CVE is:

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

The weakness was presented 04/28/2023. It is possible to read the advisory at concretecms.org. This vulnerability is known as CVE-2023-28821 since 03/24/2023. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1552 according to MITRE ATT&CK.

Upgrading to version 9.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-1366). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Content Management System

Vendor

Concrete

Name

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CNA Base Score: 5.3
CNA Vector (MITRE): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Password recovery
CWE: CWE-640
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: CMS 9.1

Timelineinfo

03/24/2023 🔍
04/28/2023 +34 days 🔍
04/28/2023 +0 days 🔍
07/12/2025 +806 days 🔍

Sourcesinfo

Advisory: concretecms.org
Status: Confirmed

CVE: CVE-2023-28821 (🔍)
GCVE (CVE): GCVE-0-2023-28821
GCVE (VulDB): GCVE-100-227683
EUVD: 🔍

Entryinfo

Created: 04/28/2023 17:19
Updated: 07/12/2025 22:50
Changes: 04/28/2023 17:19 (50), 01/30/2025 23:12 (26), 07/12/2025 22:50 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.