VDB-318679 · Submit #622194 · CVE-2025-8550

atjiu pybbs up to 6.0.0 /admin/topic/list Username 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.
3.3	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in atjiu pybbs up to 6.0.0. This impacts an unknown function of the file /admin/topic/list. This manipulation of the argument Username causes cross site scripting. The identification of this vulnerability is CVE-2025-8550. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in atjiu pybbs up to 6.0.0. It has been declared as problematic. Affected by this vulnerability is an unknown code of the file /admin/topic/list. The manipulation of the argument username with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-8550. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

Applying the patch 2fe4a51afbce0068c291bc1818bbc8f7f3b01a22 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Exploit-DB (52400) and EUVD (EUVD-2025-23608). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

atjiu

Name

pybbs

Version

License

open-source

Website

Product: https://github.com/atjiu/pybbs/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.4
VulDB Meta Temp Score: 3.3

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

NVD Base Score: 5.4
NVD Vector: 🔒

CNA Base Score: 2.4
CNA Vector: 🔒

CVSSv2info

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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

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: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 2fe4a51afbce0068c291bc1818bbc8f7f3b01a22

Timelineinfo

08/04/2025 Advisory disclosed
08/04/2025 +0 days VulDB entry created
09/04/2025 +31 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 203
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2025-8550 (🔒)
GCVE (CVE): GCVE-0-2025-8550
GCVE (VulDB): GCVE-100-318679
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/04/2025 15:10
Updated: 09/04/2025 20:40
Changes: 08/04/2025 15:10 (60), 08/05/2025 10:41 (1), 08/05/2025 11:36 (30), 08/05/2025 14:57 (1), 08/15/2025 06:30 (1), 09/04/2025 20:40 (11)
Complete: 🔍
Submitter: ZAST.AI
Cache ID: 216::103

Submitinfo

Accepted

Submit #622194: atjiu https://github.com/atjiu/pybbs <=6.0.0 Reflected XSS (by ZAST.AI)