CVE-2019-13972: LayerBB 1.1.3 allows XSS via the application/commands/new.php pm_title variable, a related issue to CVE-2019-1

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MEDIUM 6.1DOWNGRADE

CVE-2019-13972 is a medium-severity flaw (CVSS 6.1) affecting layerbb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LayerBB 1.1.3 allows XSS via the application/commands/new.php pm_title variable, a related issue to CVE-2019-17997.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: layerbb

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-19 07:15 UTCPublished CVE record published
2026-06-17 02:17 UTCUpdated Record last modified

layerbb layerbb DOWNGRADE

Affected: 1.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.3

1. Check installed version

apt-cache policy layerbb || rpm -q layerbb || layerbb --version

2. No fixed release: DOWNGRADE to a release before 1.1.3 (Debian / Ubuntu)

apt-cache madison layerbb sudo apt install layerbb=<VERSION_BEFORE_1.1.3> sudo apt-mark hold layerbb

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list layerbb sudo dnf downgrade layerbb-<VERSION_BEFORE_1.1.3> sudo dnf versionlock add layerbb

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-13972?

layerbb: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-13972 being exploited?

CVE-2019-13972 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-13972 affect?

CVE-2019-13972 affects layerbb. Severity is medium (CVSS 6.1). LayerBB 1.1.3 allows XSS via the application/commands/new.php pm_title variable, a related issue to CVE-2019-17997.

How urgent is CVE-2019-13972?

Priority 41/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2019-16531 HIGH 8.8 UPGRADE LayerBB before 1.1.4 has multiple CSRF issues, as demonstrated by changing the System Settings via admin/gener
CVE-2019-13974 HIGH 8.8 DOWNGRADE LayerBB 1.1.3 allows conversations.php/cmd/new CSRF.
CVE-2019-13973 CRITICAL 9.8 DOWNGRADE LayerBB 1.1.3 allows admin/general.php arbitrary file upload because the custom_logo filename suffix is not re
CVE-2018-17997 MEDIUM 6.1 DOWNGRADE LayerBB 1.1.1 allows XSS via the titles of conversations (PMs).
CVE-2018-17996 MEDIUM 6.5 DOWNGRADE LayerBB before 1.1.3 allows CSRF for adding a user via admin/new_user.php, deleting a user via admin/members.p

References

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