MyBB 1.8.31 Post Attachments Interface 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.
4.8$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in MyBB 1.8.31. Affected by this vulnerability is an unknown functionality of the component Post Attachments Interface. The manipulation results in cross site scripting. This vulnerability is known as CVE-2022-43708. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in MyBB 1.8.31 (Content Management System). It has been classified as problematic. Affected is an unknown code block of the component Post Attachments Interface. 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. CVE summarizes:

MyBB 1.8.31 has a (issue 2 of 2) cross-site scripting (XSS) vulnerabilities in the post Attachments interface allow attackers to inject HTML by persuading the user to upload a file with specially crafted name

The weakness was published 11/22/2022 as GHSA-p9m7-9qv4-x93w. The advisory is available at github.com. This vulnerability is traded as CVE-2022-43708 since 10/24/2022. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/30/2025). This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

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

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

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

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

NVD Base Score: 6.1
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/24/2022 🔍
11/22/2022 +29 days 🔍
11/22/2022 +0 days 🔍
04/30/2025 +890 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: GHSA-p9m7-9qv4-x93w
Status: Confirmed

CVE: CVE-2022-43708 (🔍)
GCVE (CVE): GCVE-0-2022-43708
GCVE (VulDB): GCVE-100-214170

Entryinfo

Created: 11/22/2022 14:10
Updated: 04/30/2025 04:55
Changes: 11/22/2022 14:10 (39), 12/22/2022 07:00 (11), 04/30/2025 04:55 (16)
Complete: 🔍
Cache ID: 216::103

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