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Fencer Vulns
high 7.2

CVE-2018-19274 json

phpBB Remote Code Execution

published 2018-11-17 7 y ago modified 2026-06-17 4 mo ago also GHSA-h3mr-q96r-37v4 , EUVD-2022-4053

cvss
7.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.2%
EPSS 5.2% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist phpbb/phpbb 3.2.4
  • phpbb phpbb 3.2.4
  • phpbb3 Ubuntu Pro 14.04 LTS 3.0.12-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2018-19274

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

5.20% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.ripstech.com https://blog.ripstech.com/2018/phpbb3-phar-deserialization-to-remote-code-execution/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist phpbb/phpbb
<3.2.4
3.2.4

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.