PatchTheCEVCVE-2026-65883: Joomla Extension - aimy-extensions.com - RCE via PHP object injection in Aimy Captcha-Less Form Guard 18.0 - 2
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CRITICAL 9.8REMOTEUPGRADE
CVE-2026-65883 is a critical-severity flaw (CVSS 9.8) affecting aimy captcha-less form guard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Joomla Extension - aimy-extensions.com - RCE via PHP object injection in Aimy Captcha-Less Form Guard 18.0 - 20.0 - A forged clfgd field allows PHP objection injection and thereby remote code execution.
Why this priority
- Critical severity
- 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 | 0.8% (top 43%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2026-07-29 |
| Last modified | 2026-10-23 |
Publisher (CNA): Joomla! Project · Vendor: aimy-extensions
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
aimy-extensions aimy captcha-less form guard UPGRADE
Affected: >= 18.0 and <= 20.0
Fixed in: newer than 20.0
Safe to downgrade to: a release before 18.0
1. Check installed version
apt-cache policy aimy-captcha-less-form-guard || rpm -q aimy-captcha-less-form-guard || aimy-captcha-less-form-guard --version
2. UPGRADE to newer than 20.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade aimy-captcha-less-form-guard
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade aimy-captcha-less-form-guard
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 18.0 (Debian / Ubuntu)
apt-cache madison aimy-captcha-less-form-guard
sudo apt install aimy-captcha-less-form-guard=<VERSION_BEFORE_18.0>
sudo apt-mark hold aimy-captcha-less-form-guard
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list aimy-captcha-less-form-guard
sudo dnf downgrade aimy-captcha-less-form-guard-<VERSION_BEFORE_18.0>
sudo dnf versionlock add aimy-captcha-less-form-guard
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
Fedora 46 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
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: shinthink/CVE-2026-65883 (0 stars)
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.