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Not in CISA KEV
HIGH severity

CVE-2019-16993 — phpbb

HIGHFix: phpbb/phpbb@18abef7

CVE-2019-16993 is a high-severity (CVSS 8.8) Cross-Site Request Forgery (CSRF) vulnerability in phpbb/phpbb. A fix is available for phpbb/phpbb — see the affected versions and patch details below.

phpBB Cross-Site Request Forgery (CSRF)

Also known asGHSA-vj3x-vfm4-hvxc
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.43%0.87%1.30%0.2%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘phpbb/phpbb

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

In phpBB before 3.1.7-PL1, includes/acp/acp_bbcodes.php has improper verification of a CSRF token on the BBCode page in the Administration Control Panel. An actual CSRF attack is possible if an attacker also manages to retrieve the session id of a reauthenticated administrator prior to targeting them.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistphpbb/phpbball versions3.1.7-PL1composer require phpbb/phpbb:^3.1.7-PL1

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
8.0
Application
phpbbphpbb
≤ 3.1.7
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phpbb/phpbb, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update phpbb/phpbb to 3.1.7-PL1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-16993 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

In phpBB before 3.1.7-PL1, includes/acp/acp_bbcodes.php has improper verification of a CSRF token on the BBCode page in the Administration Control Panel. An actual CSRF attack is possible if an attacker also manages to retrieve the session id of a reauthenticated administrator prior to targeting them.
O3 Security · Impact-Aware SCA

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CVE-2019-16993: phpbb CSRF — Fixed in 3.1.7-PL1