Arbitrary File Upload Vulnerability in phpBB by phpBB Group
CVE-2019-25685

8.7HIGH

Key Information:

Vendor

PHPbb

Status
PHPbb
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25685?

The phpBB software is susceptible to an arbitrary file upload vulnerability due to the exploitation of the plupload functionality and phar:// stream wrapper. Authenticated attackers can leverage this vulnerability by uploading maliciously crafted zip files that contain serialized PHP objects. These objects are executed as arbitrary code upon deserialization through the imagick parameter in the attachment settings, leading to potential unauthorized access and compromise of the affected system.

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Affected Version(s)

phpBB 3.2.3

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-2019-25685 - Proof of Concept

References

https://www.exploit-db.com/exploits/46512
exploit
https://www.vulncheck.com/advisories/phpbb-arbitrary-file...
third-party-advisory

CVSS V4

Score:
8.7
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

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