CVE-2019-11454: Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unau

Q: How do I fix CVE-2019-11454?

monit: upgrade to 5.25.3; ubuntu linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-11454 being exploited?

CVE-2019-11454 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-11454 affect?

CVE-2019-11454 affects monit, ubuntu linux, debian linux. Severity is medium (CVSS 6.1). Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to introduce arbitrary JavaScript via manipulation of an unsanitized user field of the Authorization header f

Q: How urgent is CVE-2019-11454?

Priority 52/100. Public exploit reference; On your watchlist

This month

MEDIUM 6.1WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-11454 is a medium-severity flaw (CVSS 6.1) affecting monit, ubuntu linux, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to introduce arbitrary JavaScript via manipulation of an unsanitized user field of the Authorization header for HTTP Basic Authentication, which is mishandled during an _viewlog operation.

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-04-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · debian · fedoraproject · mmonit

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

Am I affected?

Timeline

2019-04-22 16:29 UTCPublished CVE record published
2026-06-17 02:12 UTCUpdated Record last modified

mmonit monit UPGRADE

Affected: < 5.25.3

Fixed in: 5.25.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.25.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade monit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade monit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

canonical ubuntu linux MITIGATE

Affected: 18.10 · 19.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 18.10

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 31 · 32

Fixed in: no fixed release known

Safe to downgrade to: a release before 31

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2019-11454?

monit: upgrade to 5.25.3; ubuntu linux: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-11454 being exploited?

CVE-2019-11454 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-2019-11454 affect?

CVE-2019-11454 affects monit, ubuntu linux, debian linux. Severity is medium (CVSS 6.1). Persistent cross-site scripting (XSS) in http/cervlet.c in Tildeslash Monit before 5.25.3 allows a remote unauthenticated attacker to introduce arbitrary JavaScript via manipulation of an unsanitized user field of the Authorization header f

How urgent is CVE-2019-11454?

Priority 52/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

Related CVEs

CVE-2022-26563 HIGH 8.8 UPGRADE An issue was discovered in Tildeslash Monit before 5.31.0, allows remote attackers to gain escilated privlidge
CVE-2019-11455 HIGH 8.1 UPGRADE MITIGATE A buffer over-read in Util_urlDecode in util.c in Tildeslash Monit before 5.25.3 allows a remote authenticated
CVE-2019-11393 CRITICAL 9.8 UPGRADE An issue was discovered in /admin/users/update in M/Monit before 3.7.3
CVE-2016-7067 MEDIUM 6.5 UPGRADE Monit before version 5.20.0 is vulnerable to a cross site request forgery attack

References

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