CVE-2019-16993

Name: CVE-2019-16993
Creator: NVD / NIST
Published: 2019-09-30T12:15:10.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2019-16993 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.80%

52.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Phpbb	Phpbb	<= 3.1.7
Debian	Debian Linux	8.0

References

https://github.com/phpbb/phpbb/commit/18abef716ecf42a35416444f3f84f5459d573789Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00036.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00006.htmlThird Party Advisory
https://www.phpbb.com/community/viewtopic.php?t=2352606Vendor Advisory
https://www.phpbb.com/support/documents.php?mode=changelog&version=3#v317Vendor Advisory
https://github.com/phpbb/phpbb/commit/18abef716ecf42a35416444f3f84f5459d573789Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00036.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00006.htmlThird Party Advisory
https://www.phpbb.com/community/viewtopic.php?t=2352606Vendor Advisory
https://www.phpbb.com/support/documents.php?mode=changelog&version=3#v317Vendor Advisory

Timeline

Published: Sep 30, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16993?

How severe is CVE-2019-16993?

CVE-2019-16993 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16993?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16993?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST