CVE-2026-49049: The Helix3 plugin for Joomla exposes an ajax handler task, that allows unauthenticated attackers to delete arb

Q: How do I fix CVE-2026-49049?

helix3: upgrade to newer than 3.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-49049 being exploited?

CVE-2026-49049 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-2026-49049 affect?

CVE-2026-49049 affects helix3. Severity is high (CVSS 7.5). The Helix3 plugin for Joomla exposes an ajax handler task, that allows unauthenticated attackers to delete arbitrary files, write arbitrary JSON files and update template parameters.

Q: How urgent is CVE-2026-49049?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-49049 is a high-severity flaw (CVSS 7.5) affecting helix3. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Helix3 plugin for Joomla exposes an ajax handler task, that allows unauthenticated attackers to delete arbitrary files, write arbitrary JSON files and update template parameters.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-06-29
Last modified	2026-10-25

Publisher (CNA): Joomla! Project · Vendor: ollyo

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-29 15:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

ollyo helix3 UPGRADE

Affected: >= 1.0 and <= 3.1.1

Fixed in: newer than 3.1.1

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy helix3 || rpm -q helix3 || helix3 --version

2. UPGRADE to newer than 3.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade helix3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade helix3

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison helix3 sudo apt install helix3=<VERSION_BEFORE_1.0> sudo apt-mark hold helix3

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list helix3 sudo dnf downgrade helix3-<VERSION_BEFORE_1.0> sudo dnf versionlock add helix3

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.

Nuclei scan template: JoomShaper Helix3 <=3.1.0 - Unauthenticated Arbitrary JSON File Write

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-2026-49049?

helix3: upgrade to newer than 3.1.1. Exact commands for each OS are on this page.

Is CVE-2026-49049 being exploited?

CVE-2026-49049 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-2026-49049 affect?

CVE-2026-49049 affects helix3. Severity is high (CVSS 7.5). The Helix3 plugin for Joomla exposes an ajax handler task, that allows unauthenticated attackers to delete arbitrary files, write arbitrary JSON files and update template parameters.

How urgent is CVE-2026-49049?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

Software pages

Joomla vulnerabilities

References

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