CVE-2026-2952: A flaw has been found in Vaelsys 4.1.0

This week

HIGH 7.3REMOTEDOWNGRADE

CVE-2026-2952 is a high-severity flaw (CVSS 7.3) affecting vaelsys. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in Vaelsys 4.1.0. This vulnerability affects unknown code of the file /tree/tree_server.php of the component HTTP POST Request Handler. This manipulation of the argument xajaxargs causes os command injection. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

High severity
EPSS top 5%: 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	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	8.4% (top 5%)
CISA exploited list	No
Weakness	CWE-77, CWE-78
Published	2026-02-22
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: vaelsys

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

Am I affected?

Timeline

2026-02-22 14:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

vaelsys vaelsys DOWNGRADE

Affected: 4.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.1.0 (Debian / Ubuntu)

apt-cache madison vaelsys sudo apt install vaelsys=<VERSION_BEFORE_4.1.0> sudo apt-mark hold vaelsys

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

dnf --showduplicates list vaelsys sudo dnf downgrade vaelsys-<VERSION_BEFORE_4.1.0> sudo dnf versionlock add vaelsys

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 46 · python-configargparse · FIXED · 1.9.0-1.fc46 · FEDORA-2026-3ab7c44443 · source

sudo dnf upgrade --advisory=FEDORA-2026-3ab7c44443

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: github.com/CVE-Hunter-Leo/CVE/issues/10
Write-up: vuldb.com/?id.347318

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-2026-2952?

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

Is CVE-2026-2952 being exploited?

CVE-2026-2952 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-2026-2952 affect?

CVE-2026-2952 affects vaelsys. Severity is high (CVSS 7.3). A flaw has been found in Vaelsys 4.1.0. This vulnerability affects unknown code of the file /tree/tree_server.php of the component HTTP POST Request Handler. This manipulation of the argument xajaxargs causes os command injection. The attac

How urgent is CVE-2026-2952?

Priority 59/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-8261 HIGH 7.3 DOWNGRADE A weakness has been identified in Vaelsys VaelsysV4 4.1.0
CVE-2025-8260 LOW 3.1 DOWNGRADE A security flaw has been discovered in Vaelsys VaelsysV4 up to 5.1.0/5.4.0
CVE-2025-8259 HIGH 7.3 DOWNGRADE A vulnerability was identified in Vaelsys VaelsysV4 up to 5.1.0/5.4.0

References

← Back to latest CVEs