Local File Inclusion Vulnerability in Discuz! X5.0 by Discuz!
CVE-2026-49954

8.6HIGH

Key Information:

Vendor

Discuz!

Status
Discuz! X5.0
Vendor
CVE Published:
15 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-49954?

Discuz! X5.0 versions released between 20260320 and 20260501 exhibit a local file inclusion vulnerability that allows authenticated administrators to exploit improperly sanitized input. By importing plugin configurations containing path traversal sequences, attackers can bypass input validation protections, leading to the execution of malicious code within the web server environment. This vulnerability poses a significant risk, especially when combined with file upload functionalities, resulting in a potential breach of the application's security.

Affected Version(s)

Discuz! X5.0 20260320 <= 20260610

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-49954 - Proof of Concept

References

https://karmainsecurity.com/KIS-2026-11
technical-description
https://karmainsecurity.com/chaining-bugs-in-discuz-from-...
exploit
https://www.vulncheck.com/advisories/discuz-x5-0-local-fi...
third-party-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Egidio Romano
.