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Vulnerability record · CVE-2018-19274 · published 17 November 2018

CVE-2018-19274: Phpbb deserialization of untrusted data vulnerability

Phpbb · Phpbb

Passing an absolute path to a file_exists check in phpBB before 3.2.4 allows Remote Code Execution through Object Injection by employing Phar deserialization when an attacker has access to the Admin Control Panel with founder permissions.

7.2 CVSS 3.1 High EPSS 5.2% · top 7.8% CWE-502 · Deserialization of untrusted dataCWE-1321 · Prototype pollution
7.2CVSS 3.1 base score, v2 6.5
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Passing an absolute path to a file_exists check in phpBB before 3.2.4 allows Remote Code Execution through Object Injection by employing Phar deserialization when an attacker has access to the Admin Control Panel with founder permissions.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.ripstech.com/2018/phpbb3-phar-deserialization-to-remote-code-execution/ ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00029.html Mailing ListThird Party Advisory
https://www.phpbb.com/community/viewtopic.php?f=14&t=2492206 PatchVendor Advisory
https://blog.ripstech.com/2018/phpbb3-phar-deserialization-to-remote-code-execution/ ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/11/msg00029.html Mailing ListThird Party Advisory
https://www.phpbb.com/community/viewtopic.php?f=14&t=2492206 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-19274), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.