CVE-2023-54339: Webgrind 1.1 contains a remote command execution vulnerability that allows unauthenticated attackers to inject

Q: How do I fix CVE-2023-54339?

webgrind: upgrade to newer than 1.1. Exact commands for each OS are on this page.

Q: Is CVE-2023-54339 being exploited?

CVE-2023-54339 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-2023-54339 affect?

CVE-2023-54339 affects webgrind. Severity is critical (CVSS 9.8). Webgrind 1.1 contains a remote command execution vulnerability that allows unauthenticated attackers to inject OS commands via the dataFile parameter in index.php. Attackers can execute arbitrary system commands by manipulating the dataFile

Q: How urgent is CVE-2023-54339?

Priority 67/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-54339 is a critical-severity flaw (CVSS 9.8) affecting webgrind. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Webgrind 1.1 contains a remote command execution vulnerability that allows unauthenticated attackers to inject OS commands via the dataFile parameter in index.php. Attackers can execute arbitrary system commands by manipulating the dataFile parameter, such as using payload '0%27%26calc.exe%26%27' to execute commands on the target system.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
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	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-01-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: webgrind project

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

Am I affected?

Timeline

2026-01-13 23:16 UTCPublished CVE record published
2026-06-17 06:47 UTCUpdated Record last modified

webgrind project webgrind UPGRADE

Affected: <= 1.1

Fixed in: newer than 1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webgrind

Note

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

Exact fixes by distribution

Fedora 46 · jgmenu · FIXED · 4.7.0-1.fc46 · FEDORA-2026-3053ee4399 · source

sudo dnf upgrade --advisory=FEDORA-2026-3053ee4399

Fedora ELN · python-tkrzw · FIXED · 0.1.32-12.eln159 · FEDORA-2026-0161d71544 · source

sudo dnf upgrade --advisory=FEDORA-2026-0161d71544

Public exploits and detection

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

Write-up: www.exploit-db.com/exploits/51074

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-2023-54339?

webgrind: upgrade to newer than 1.1. Exact commands for each OS are on this page.

Is CVE-2023-54339 being exploited?

CVE-2023-54339 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-2023-54339 affect?

CVE-2023-54339 affects webgrind. Severity is critical (CVSS 9.8). Webgrind 1.1 contains a remote command execution vulnerability that allows unauthenticated attackers to inject OS commands via the dataFile parameter in index.php. Attackers can execute arbitrary system commands by manipulating the dataFile

How urgent is CVE-2023-54339?

Priority 67/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2023-54341 MEDIUM 6.1 UPGRADE Webgrind 1.1 and before contains a reflected cross-site scripting vulnerability that allows unauthenticated at

References

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