CVE-2018-16836: Rubedo through 3.4.0 contains a Directory Traversal vulnerability in the theme component, allowing unauthentic

Q: How do I fix CVE-2018-16836?

rubedo: upgrade to newer than 3.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-16836 being exploited?

CVE-2018-16836 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-2018-16836 affect?

CVE-2018-16836 affects rubedo. Severity is critical (CVSS 9.8). Rubedo through 3.4.0 contains a Directory Traversal vulnerability in the theme component, allowing unauthenticated attackers to read and execute arbitrary files outside of the service root path, as demonstrated by a /theme/default/img/%2e%2

Q: How urgent is CVE-2018-16836?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2018-16836 is a critical-severity flaw (CVSS 9.8) affecting rubedo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Rubedo through 3.4.0 contains a Directory Traversal vulnerability in the theme component, allowing unauthenticated attackers to read and execute arbitrary files outside of the service root path, as demonstrated by a /theme/default/img/%2e%2e/..//etc/passwd URI.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	61.4% (top 1%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-09-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rubedo project

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

Am I affected?

Timeline

2018-09-11 16:29 UTCPublished CVE record published
2026-06-17 01:44 UTCUpdated Record last modified

rubedo project rubedo UPGRADE

Affected: <= 3.4.0

Fixed in: newer than 3.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.4.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rubedo

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Rubedo CMS 3.4.0 - Directory Traversal
Nuclei scan template: Rubedo CMS <=3.4.0 - Directory Traversal

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-2018-16836?

rubedo: upgrade to newer than 3.4.0. Exact commands for each OS are on this page.

Is CVE-2018-16836 being exploited?

CVE-2018-16836 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-2018-16836 affect?

CVE-2018-16836 affects rubedo. Severity is critical (CVSS 9.8). Rubedo through 3.4.0 contains a Directory Traversal vulnerability in the theme component, allowing unauthenticated attackers to read and execute arbitrary files outside of the service root path, as demonstrated by a /theme/default/img/%2e%2

How urgent is CVE-2018-16836?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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