CVE-2024-46256: A Command injection vulnerability in requestLetsEncryptSsl in NginxProxyManager 2.11.3 allows an attacker to R

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CRITICAL 9.8REMOTEWATCHLISTDOWNGRADE

CVE-2024-46256 is a critical-severity flaw (CVSS 9.8) affecting nginx proxy manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Command injection vulnerability in requestLetsEncryptSsl in NginxProxyManager 2.11.3 allows an attacker to RCE via Add Let's Encrypt Certificate.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

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	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-77
Published	2024-09-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jc21

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

Am I affected?

Timeline

2024-09-27 18:15 UTCPublished CVE record published
2026-06-17 07:55 UTCUpdated Record last modified

jc21 nginx proxy manager DOWNGRADE

Affected: 2.11.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.11.3

1. Check installed version

apt-cache policy nginx-proxy-manager || rpm -q nginx-proxy-manager || nginx-proxy-manager --version

2. No fixed release: DOWNGRADE to a release before 2.11.3 (Debian / Ubuntu)

apt-cache madison nginx-proxy-manager sudo apt install nginx-proxy-manager=<VERSION_BEFORE_2.11.3> sudo apt-mark hold nginx-proxy-manager

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

dnf --showduplicates list nginx-proxy-manager sudo dnf downgrade nginx-proxy-manager-<VERSION_BEFORE_2.11.3> sudo dnf versionlock add nginx-proxy-manager

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · gram_grep · FIXED · 0.10.4-1.eln159 · FEDORA-2026-0808475f2a · source

sudo dnf upgrade --advisory=FEDORA-2026-0808475f2a

Fedora 46 · wesnoth · FIXED · 1.19.29-1.fc46 · FEDORA-2026-58f458e24e · source

sudo dnf upgrade --advisory=FEDORA-2026-58f458e24e

Public exploits and detection

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

GitHub PoC: barttran2k/POC_CVE-2024-46256 (6 stars)
GitHub PoC: kimtangker/CVE-2024-46256 (0 stars)
GitHub PoC: TranDongA3/Simulation_CVE-2024-46256 (0 stars)
Write-up: github.com/NginxProxyManager/nginx-proxy-manager/pull/4073/commits/c39d5433bcd13993def222b

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-2024-46256?

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

Is CVE-2024-46256 being exploited?

CVE-2024-46256 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-2024-46256 affect?

CVE-2024-46256 affects nginx proxy manager. Severity is critical (CVSS 9.8). A Command injection vulnerability in requestLetsEncryptSsl in NginxProxyManager 2.11.3 allows an attacker to RCE via Add Let's Encrypt Certificate.

How urgent is CVE-2024-46256?

Priority 74/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

nginx vulnerabilities

Related CVEs

CVE-2025-50579 MEDIUM 5.3 DOWNGRADE A CORS misconfiguration in Nginx Proxy Manager v2.12.3 allows unauthorized domains to access sensitive data, p
CVE-2024-46257 MEDIUM 6.3 DOWNGRADE A Command injection vulnerability in requestLetsEncryptSslWithDnsChallenge in NginxProxyManager 2.11.3 allows
CVE-2024-39935 HIGH 8.8 UPGRADE jc21 NGINX Proxy Manager before 2.11.3 allows backend/internal/certificate.js OS command injection by an authe

References

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