CVE-2019-12276: A Path Traversal vulnerability in Controllers/LetsEncryptController.cs in LetsEncryptController in GrandNode 4

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2019-12276 is a high-severity flaw (CVSS 7.5) affecting grandnode. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Path Traversal vulnerability in Controllers/LetsEncryptController.cs in LetsEncryptController in GrandNode 4.40 allows remote, unauthenticated attackers to retrieve arbitrary files on the web server via specially crafted LetsEncrypt/Index?fileName= HTTP requests. A patch for this issue was made on 2019-05-30 in GrandNode 4.40.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	60.1% (top 1%)
CISA exploited list	No
Weakness	CWE-22
Published	2019-06-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: grandnode

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

Am I affected?

Timeline

2019-06-05 18:29 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

grandnode grandnode DOWNGRADE

Affected: 4.40

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.40

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.40 (Debian / Ubuntu)

apt-cache madison grandnode sudo apt install grandnode=<VERSION_BEFORE_4.40> sudo apt-mark hold grandnode

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

dnf --showduplicates list grandnode sudo dnf downgrade grandnode-<VERSION_BEFORE_4.40> sudo dnf versionlock add grandnode

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.

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: GrandNode 4.40 - Path Traversal / Arbitrary File Download
Nuclei scan template: GrandNode 4.40 - Local File Inclusion

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-2019-12276?

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

Is CVE-2019-12276 being exploited?

CVE-2019-12276 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-2019-12276 affect?

CVE-2019-12276 affects grandnode. Severity is high (CVSS 7.5). A Path Traversal vulnerability in Controllers/LetsEncryptController.cs in LetsEncryptController in GrandNode 4.40 allows remote, unauthenticated attackers to retrieve arbitrary files on the web server via specially crafted LetsEncrypt/Index

How urgent is CVE-2019-12276?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs