Bug 2240807 (CVE-2023-3550)

Summary: CVE-2023-3550 mediawiki: stored XSS leads to privilege escalation
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2240808    
Bug Blocks: 2240809    

Description Guilherme de Almeida Suckevicz 2023-09-26 16:53:12 UTC 
Mediawiki v1.40.0 does not validate namespaces used in XML files. Therefore, if the instance administrator allows XML file uploads, a remote attacker with a low-privileged user account can use this exploit to become an administrator by sending a malicious link to the instance administrator.

Reference:
https://fluidattacks.com/advisories/blondie/
Comment 1 Guilherme de Almeida Suckevicz 2023-09-26 16:53:25 UTC 
Created mediawiki tracking bugs for this issue:

Affects: fedora-all [bug 2240808]