CVE-2018-9036: CheckSec Canopy 3.x before 3.0.7 has stored XSS via the Login Page Disclaimer, allowing attacks by low-privile

Routine

MEDIUM 4.8UPGRADE

CVE-2018-9036 is a medium-severity flaw (CVSS 4.8) affecting canopy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CheckSec Canopy 3.x before 3.0.7 has stored XSS via the Login Page Disclaimer, allowing attacks by low-privileged users against higher-privileged users.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-06-20
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: checksec

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

Am I affected?

Timeline

2018-06-20 15:29 UTCPublished CVE record published
2026-06-17 02:05 UTCUpdated Record last modified

checksec canopy UPGRADE

Affected: >= 3.0.0 and <= 3.0.6

Fixed in: newer than 3.0.6

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to newer than 3.0.6 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade canopy

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison canopy sudo apt install canopy=<VERSION_BEFORE_3.0.0> sudo apt-mark hold canopy

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list canopy sudo dnf downgrade canopy-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add canopy

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-2018-9036?

canopy: upgrade to newer than 3.0.6. Exact commands for each OS are on this page.

Is CVE-2018-9036 being exploited?

CVE-2018-9036 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-2018-9036 affect?

CVE-2018-9036 affects canopy. Severity is medium (CVSS 4.8). CheckSec Canopy 3.x before 3.0.7 has stored XSS via the Login Page Disclaimer, allowing attacks by low-privileged users against higher-privileged users.

How urgent is CVE-2018-9036?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2021-34815 MEDIUM 4.8 UPGRADE CheckSec Canopy before 3.5.2 allows XSS attacks against the login page via the LOGIN_PAGE_DISCLAIMER parameter

References

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