dotCMS 3.5.x Captcha access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability has been found in dotCMS 3.5.x (Content Management System) and classified as critical. Affected by this vulnerability is some unknown processing of the component Captcha. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

In dotCMS 3.2.1, attacker can load captcha once, fill it with correct value and then this correct value is ok for forms with captcha check later.

The weakness was released 10/19/2016 by Elar Lang as #9330 as not defined mailinglist post (Full-Disclosure). The advisory is shared at The public release was coordinated with the project team. This vulnerability is known as CVE-2016-8600 since 10/11/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue. The advisory points out:

Attacker must first fill manually valid CAPTCHA code. No other pre-conditions - no authentication or authorization needed.

The vulnerability was handled as a non-public zero-day exploit for at least 98 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.6.0 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

Additional details are provided at Entries connected to this vulnerability are available at VDB-106417, VDB-120446, VDB-123263 and VDB-123966.






CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 6.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍



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

NVD Base Score: 🔍


Class: Access control
CWE: CWE-264

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍

Upgrade: dotCMS 3.6.0


05/27/2016 🔍
07/06/2016 +40 days 🔍
09/02/2016 +58 days 🔍
10/11/2016 +39 days 🔍
10/19/2016 +8 days 🔍
10/20/2016 +1 days 🔍
10/20/2016 +0 days 🔍
10/28/2016 +8 days 🔍
05/14/2019 +928 days 🔍


Advisory: #9330
Researcher: Elar Lang
Status: Not defined
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-8600 (🔍)
SecurityFocus: 93798 - dotCMS CVE-2016-8600 Security Bypass Vulnerability

Misc.: 🔍
See also: 🔍


Created: 10/20/2016 10:08 AM
Updated: 05/14/2019 09:53 AM
Changes: 10/20/2016 10:08 AM (61), 05/14/2019 09:53 AM (13)
Complete: 🔍
Cache ID: 3:BA6:40


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