CVE-2019-12834: In HT2 Labs Learning Locker 3.15.1, it's possible to inject malicious HTML and JavaScript code into the DOM of

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HIGH 7.3REMOTEDOWNGRADE

CVE-2019-12834 is a high-severity flaw (CVSS 7.3) affecting learning locker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In HT2 Labs Learning Locker 3.15.1, it's possible to inject malicious HTML and JavaScript code into the DOM of the website via the PATH_INFO to the dashboards/ URI.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-07-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ht2labs

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

Am I affected?

Timeline

2019-07-16 18:15 UTCPublished CVE record published
2026-06-17 02:15 UTCUpdated Record last modified

ht2labs learning locker DOWNGRADE

Affected: 3.15.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.15.1

1. Check installed version

apt-cache policy learning-locker || rpm -q learning-locker || learning-locker --version

2. No fixed release: DOWNGRADE to a release before 3.15.1 (Debian / Ubuntu)

apt-cache madison learning-locker sudo apt install learning-locker=<VERSION_BEFORE_3.15.1> sudo apt-mark hold learning-locker

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

dnf --showduplicates list learning-locker sudo dnf downgrade learning-locker-<VERSION_BEFORE_3.15.1> sudo dnf versionlock add learning-locker

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-2019-12834?

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

Is CVE-2019-12834 being exploited?

CVE-2019-12834 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-2019-12834 affect?

CVE-2019-12834 affects learning locker. Severity is high (CVSS 7.3). In HT2 Labs Learning Locker 3.15.1, it's possible to inject malicious HTML and JavaScript code into the DOM of the website via the PATH_INFO to the dashboards/ URI.

How urgent is CVE-2019-12834?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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