CVE-2018-19301: tp4a TELEPORT 3.1.0 allows XSS via the login page because a crafted username is mishandled when an administrat

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MEDIUM 6.1DOWNGRADE

CVE-2018-19301 is a medium-severity flaw (CVSS 6.1) affecting teleport. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

tp4a TELEPORT 3.1.0 allows XSS via the login page because a crafted username is mishandled when an administrator later views the system log.

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	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-11-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tp4a

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

Am I affected?

Timeline

2018-11-15 23:29 UTCPublished CVE record published
2026-06-17 01:49 UTCUpdated Record last modified

tp4a teleport DOWNGRADE

Affected: 3.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.1.0 (Debian / Ubuntu)

apt-cache madison teleport sudo apt install teleport=<VERSION_BEFORE_3.1.0> sudo apt-mark hold teleport

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

dnf --showduplicates list teleport sudo dnf downgrade teleport-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add teleport

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-2018-19301?

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

Is CVE-2018-19301 being exploited?

CVE-2018-19301 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-2018-19301 affect?

CVE-2018-19301 affects teleport. Severity is medium (CVSS 6.1). tp4a TELEPORT 3.1.0 allows XSS via the login page because a crafted username is mishandled when an administrator later views the system log.

How urgent is CVE-2018-19301?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2022-38599 MEDIUM 6.5 DOWNGRADE Teleport v3.2.2, Teleport v3.5.6-rc6, and Teleport v3.6.3-b2 was discovered to contain an information leak via
CVE-2022-36633 HIGH 8.8 UPGRADE Teleport 9.3.6 is vulnerable to Command injection leading to Remote Code Execution
CVE-2018-19555 HIGH 8.8 DOWNGRADE tp4a TELEPORT 3.1.0 has CSRF via user/do-reset-password to change any password, such as the administrator pass

References

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