FUDForum 3.1.0 index.php Author cross site scripting

HistoryDiffrelatejsonxmlCTI

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.
4.6	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in FUDForum 3.1.0. Affected by this vulnerability is an unknown functionality of the file index.php. Such manipulation of the argument Author leads to cross site scripting. This vulnerability is uniquely identified as CVE-2021-27520. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability was found in FUDForum 3.1.0 (Forum Software). It has been rated as problematic. Affected by this issue is an unknown code block of the file index.php. The manipulation of the argument author with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity.

The weakness was disclosed 03/20/2021. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-27520. Successful exploitation requires user interaction by the victim. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059.007.

The exploit is available at packetstormsecurity.com. It is declared as proof-of-concept. By approaching the search of inurl:index.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (49943). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Forum Software

Name

FUDForum

Version

3.1.0

Website

Product: https://github.com/fudforum/FUDforum/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.6

VulDB Base Score: 3.5
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
NVD Vector: 🔍

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: 🔍

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

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/22/2021 🔍
03/20/2021 +26 days 🔍
03/20/2021 +0 days 🔍
05/04/2025 +1506 days 🔍

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Not defined

CVE: CVE-2021-27520 (🔍)
GCVE (CVE): GCVE-0-2021-27520
GCVE (VulDB): GCVE-100-171512
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/20/2021 16:04
Updated: 05/04/2025 03:50
Changes: 03/20/2021 16:04 (37), 04/03/2021 12:17 (2), 04/03/2021 12:21 (18), 07/03/2024 19:29 (23), 12/16/2024 11:53 (5), 05/04/2025 03:50 (4)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.