VDB-305591 · CVE-2025-29458 · EUVD-2025-11802

MyBB 1.8.38 Change Avatar information disclosure

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.
4.3	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in MyBB 1.8.38. Affected by this vulnerability is an unknown functionality of the component Change Avatar Handler. The manipulation leads to information disclosure. This vulnerability is documented as CVE-2025-29458. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in MyBB 1.8.38 and classified as problematic. This issue affects some unknown processing of the component Change Avatar Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Change Avatar function.

It is possible to read the advisory at yuque.com. The identification of this vulnerability is CVE-2025-29458 since 03/11/2025. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/24/2025). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

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 EUVD (EUVD-2025-11802). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Content Management System

Name

MyBB

Version

1.8.38

License

open-source

Website

Product: https://mybb.com/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/11/2025 🔍
04/17/2025 +36 days 🔍
04/17/2025 +0 days 🔍
05/24/2025 +37 days 🔍

Sourcesinfo

Product: mybb.com

Advisory: yuque.com
Status: Not defined

CVE: CVE-2025-29458 (🔍)
GCVE (CVE): GCVE-0-2025-29458
GCVE (VulDB): GCVE-100-305591
EUVD: 🔍

Entryinfo

Created: 04/18/2025 00:00
Updated: 05/24/2025 22:47
Changes: 04/18/2025 00:00 (53), 04/23/2025 15:39 (1), 05/24/2025 22:47 (1)
Complete: 🔍
Cache ID: 216::103