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23 October 2026
At a Glance
The October 2026 critical PHP security release highlighted vulnerabilities that could expose affected websites and applications to malicious code execution. Businesses should check their PHP versions, confirm hosting updates, apply security patches and investigate suspicious activity. Managed cyber security providers can support vulnerability assessments, patch management, security monitoring and incident response to reduce exposure to future threats.
Contact Redpalm to discuss your cyber security requirements.
PHP Security Vulnerabilities
PHP is a widely used web development language and powers platforms including WordPress. But newly discovered PHP security vulnerabilities have triggered urgent warnings for businesses that depend on these systems.
In October 2026, the PHP project released a critical security update, and WordPress and the UK’s National Cyber Security Centre (NCSC) urged businesses to act immediately.
This discovery also reminds businesses that outdated software can create serious cyber security risks even when websites and applications seem to be functional.
What Happened in the October 2026 Critical PHP Security Release?
On October 21, 2026, the PHP project announced security updates addressing two critical security vulnerabilities in PHP, CVE-2026-109618 and CVE-2026-109619. Under certain conditions, attackers can exploit these PHP security issues to execute malicious code remotely on affected servers, putting websites, applications and sensitive business information at risk.
With the discovery, WordPress also issued a PHP security announcement, strongly recommending that website owners update their PHP installations immediately. However, updating WordPress alone may not resolve the underlying issue, as these are not WordPress-specific security vulnerabilities. These issues affect PHP, which means other PHP-based applications may also be vulnerable.
In its PHP vulnerability update, NCSC urged UK organisations to quickly identify affected systems, take immediate action on internet-facing applications and prioritise applying the necessary security updates.
What Should Your Business Do Following the Critical PHP Security Vulnerability Alert?
Your business should immediately find out whether systems are affected and address any weaknesses.
Here are some of the recommended steps:
- Check your PHP version: WordPress administrators can find this under Tools → Site Health → Info → Server.
- Check with your hosting provider: Confirm if the critical PHP security updates have been applied.
- Identify vulnerable systems: Check PHP installations across your infrastructure, including your servers, applications and third-party software that use PHP.
- Apply security patches: Update PHP to 8.2.35, 8.3.36, 8.4.27 or 8.5.12, or install vendor-supplied security fixes.
- Check for suspicious behaviour: Review your security logs for signs of attempted exploitation or any related suspicious activity.
- Review any unsupported software: PHP versions older than 8.2 no longer receive any security updates from the PHP project.
Organisations should apply the relevant PHP security update as soon as possible. Where immediate remediation is not feasible, the NCSC recommends considering taking the affected system offline until it can be fully mitigated.
How Can Managed Cyber Security Providers Like Redpalm Help?
Unexpected critical security vulnerabilities can leave your organisation with little to no time to respond. Without a dedicated cyber security team, you may struggle to identify which systems are affected, what updates are a priority and how to monitor future threats.
Working with a managed cyber security provider such as Redpalm can help your business develop a more proactive security approach.
How our services can support:
- Vulnerability assessments: We can identify any outdated software and potential security weaknesses across supported systems in your IT environment.
- Vulnerability management (VMaaS): We continuously assess and prioritise vulnerabilities, rather than relying on one-off checks.
- Patch management: We can manage software updates and security patches to reduce your exposure to known vulnerabilities.
- Security monitoring: We can help detect suspicious activity that could indicate an attempted or successful cyber breach.
- Incident response: We can assist you in investigating, containing and recovering from security incidents.
Although your hosting provider or internal IT team are usually responsible for PHP updates, Redpalm can help your business identify broader security risks and support remediation.
Protect Your Business Against Future Critical Vulnerabilities With Redpalm
The October 2026 PHP security vulnerability alert reminds organisations to treat cyber security as an ongoing effort, not something to address only when a critical warning appears.
Redpalm provides practical cyber security and IT support to help UK businesses improve their security posture, manage vulnerabilities and respond to emerging threats.
If you’re concerned about vulnerabilities and security issues in your PHP site or applications, talk to our experts today.
