VDB-185202 · CVE-2021-39357 · ID 2615195

Leaky Paywall Plugin up to 4.16.5 on WordPress ~/class.php cross site scripting

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.
4.2	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Leaky Paywall Plugin up to 4.16.5 on WordPress. The affected element is an unknown function of the file ~/class.php. The manipulation results in cross site scripting. This vulnerability is reported as CVE-2021-39357. The attack can be launched remotely. Moreover, an exploit is present. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability classified as problematic has been found in Leaky Paywall Plugin up to 4.16.5 on WordPress (WordPress Plugin). Affected is an unknown part of the file ~/class.php. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity.

The weakness was disclosed 10/22/2021. The advisory is available at wordfence.com. This vulnerability is traded as CVE-2021-39357 since 08/20/2021. Successful exploitation requires user interaction by the victim. Technical details and a public exploit are known. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

The exploit is shared for download at github.com. It is declared as proof-of-concept. By approaching the search of inurl:~/class.php it is possible to find vulnerable targets with Google Hacking.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at plugins.trac.wordpress.org.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

WordPress Plugin

Name

Leaky Paywall Plugin

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.2

VulDB Base Score: 2.4
VulDB Temp Score: 2.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.8
NVD Vector: 🔍

CNA Base Score: 5.5
CNA Vector (Wordfence): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Google Hack: 🔍

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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: plugins.trac.wordpress.org

Timelineinfo

08/20/2021 🔍
10/22/2021 +63 days 🔍
10/22/2021 +0 days 🔍
10/28/2021 +6 days 🔍

Sourcesinfo

Advisory: 2615195
Status: Confirmed

CVE: CVE-2021-39357 (🔍)
GCVE (CVE): GCVE-0-2021-39357
GCVE (VulDB): GCVE-100-185202
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/22/2021 07:07
Updated: 10/28/2021 14:19
Changes: 10/22/2021 07:07 (53), 10/28/2021 14:14 (2), 10/28/2021 14:19 (18)
Complete: 🔍
Cache ID: 216::103