How severe is CVE-2026-34424?

CVE-2026-34424 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34424 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34424?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34424 have an EU (EUVD) identifier?

Yes. CVE-2026-34424 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21225.

When was CVE-2026-34424 published?

CVE-2026-34424 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-34424

CVE-2026-34424 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-506.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21225
Weakness: CWE-506
Published: 2026-04-09
Last modified: 2026-06-17

Description

Smart Slider 3 Pro version 3.5.1.35 for WordPress and Joomla contains a multi-stage remote access toolkit injected through a compromised update system that allows unauthenticated attackers to execute arbitrary code and commands. Attackers can trigger pre-authentication remote shell execution via HTTP headers, establish authenticated backdoors accepting arbitrary PHP code or OS commands, create hidden administrator accounts, exfiltrate credentials and access keys, and maintain persistence through multiple injection points including must-use plugins and core file modifications.

Frequently asked questions

What is CVE-2026-34424?: Smart Slider 3 Pro version 3.5.1.35 for WordPress and Joomla contains a multi-stage remote access toolkit injected through a compromised update system that allows unauthenticated attackers to execute arbitrary code and commands. Attackers can trigger pre-authentication remote shell execution via HTTP headers, establish authenticated backdoors accepting arbitrary PHP code or OS commands, create hidden administrator accounts, exfiltrate credentials and access keys, and maintain persistence through multiple injection points including must-use plugins and core file modifications.
How severe is CVE-2026-34424?: CVE-2026-34424 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34424 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-34424?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34424 have an EU (EUVD) identifier?: Yes. CVE-2026-34424 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21225.
When was CVE-2026-34424 published?: CVE-2026-34424 was published on 2026-04-09 and last updated on 2026-06-17.

References

Other CWE-506 vulnerabilities

CVE-2026-28353 — Critical (CVSS 10.0): Trivy Vulnerability Scanner is a VS Code extension that helps find vulnerabilities. In Trivy VSCode Extension version…
CVE-2024-3094 — Critical (CVSS 10.0): Malicious code was discovered in the upstream tarballs of xz, starting with version 5.6.0. Through a series of…
CVE-2026-48027 — Critical (CVSS 9.8): Nx Console is the user interface for Nx & Lerna. On 19 May 2026, a malicious version of Nx Console, 18.95.0, was…
CVE-2026-8398 — Critical (CVSS 9.8): A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421…
CVE-2026-44484 — Critical (CVSS 9.8): PyTorch Lightning is a deep learning framework to pretrain and finetune AI models. Versions 2.6.2 and 2.6.2 have…
CVE-2026-6443 — Critical (CVSS 9.8): All plugins by Essentialplugin for WordPress are vulnerable to an injected backdoor in various versions. This is due to…

Browse all CWE-506 vulnerabilities →