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PHP security advisory: Critical remote code execution vulnerabilities, update now (21 Oct 2026)

angstromangstrom Moderator, Veteran

This seems worthy of an announcement:

PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35 fix two critical vulnerabilities that can allow unauthenticated remote code execution. All PHP users are strongly encouraged to update immediately.

See https://www.php.net/archive/2026.php#2026-10-21-5

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Comments

  • rpqurpqu Member
    edited 3:04PM

    First.
    Hosts, please tell me that you have patched your whmcs. Please....

  • kaitkait Member

    Debian/Ubuntu/Archlinux/Almalinux all have the patch out already.

  • neighhouseneighhouse Member
    edited 3:07PM

    @NDTN cancel your meet with FAT32 and get patching my beloved.

    You too cuties @DediRock.

    And then calm our nerves by telling us you did.

    Thanked by 1DediRock
  • NeoonNeoon Community Contributor, Veteran

    @rpqu said:
    First.
    Hosts, please tell me that you have patched your whmcs. Please....

  • MurvMurv Member, Megathread Squad

    @jbiloh have you patched LET yet?

  • angstromangstrom Moderator, Veteran
    edited 3:23PM

    @angstrom said:
    This seems worthy of an announcement:

    PHP 8.5.12, 8.4.27, 8.3.36 and 8.2.35 fix two critical vulnerabilities that can allow unauthenticated remote code execution. All PHP users are strongly encouraged to update immediately.

    See https://www.php.net/archive/2026.php#2026-10-21-5

    On the linked page, they also write (with corresponding links):

    Given the severity of these vulnerabilities, the PHP security team provided minimal source-backports for PHP 7.4, PHP 8.0, and PHP 8.1 to help people building from source or without access to an LTS vendor.

    Since these versions are EOL, this should be regarded as a best-effort attempt

  • edmarhubedmarhub Member

    fck, cloudpanel haven't release their php update yet :disappointed:

  • yoursunnyyoursunny Member, IPv6 Advocate

    PHP-based billing panels:

    • WHMCS
    • Blesta
    • HostBill
    • BillingServ
    • ClientExec
    • FOSSBilling

    What hackers can do:

    • leak customer data — GDPR lawsuits
    • charge stored cards (although money goes to you) — chargebacks
    • call hypervisor API (see below)

    PHP-based hypervisor panels:

    • SolusVM 1.x
    • Virtualizor
    • VirtFusion
    • Tenantos
    • Convoy

    What hackers can do:

    • delete VPS — angry tickets from and refunds for managed clients, drama threads from unmanaged clients
    • create VPS — mine monero, send spam — your IP listed on Spamhaus
    • do naughty inside the VPS (see below)

    PHP-based shared hosting panels:

    • Plesk
    • ISPConfig
    • Froxlor

    What hackers can do:

    • delete files, deface website, wipe databases — angry tickets from and refunds for managed clients, drama threads from unmanaged clients

    These panels are not PHP based:

    • Billing: BILLmanager (C++)
    • Hypervisor: Proxmox VE (Perl), SolusIO (Go), OpenStack (Python)
    • Shared hosting: cPanel (Perl), DirectAdmin (C++), aaPanel (Python)

    You can escape PHP vulnerabilities, but they can have their own vulnerabilities.

    Research performed by Muse.ai, "what hackers can do" sections written by the flesh.

  • sillycatsillycat Member

    @yoursunny said: What hackers can do:

    • goon to customers pornography
  • @sillycat said:

    @yoursunny said: What hackers can do:

    • goon to customers pornography

    @bdspice take note

    Thanked by 1bdspice
  • hostmycodehostmycode Member, Patron Provider

    @yoursunny said:
    PHP-based billing panels:

    • WHMCS
    • Blesta
    • HostBill
    • BillingServ
    • ClientExec
    • FOSSBilling

    What hackers can do:

    • leak customer data — GDPR lawsuits
    • charge stored cards (although money goes to you) — chargebacks
    • call hypervisor API (see below)

    PHP-based hypervisor panels:

    • SolusVM 1.x
    • Virtualizor
    • VirtFusion
    • Tenantos
    • Convoy

    What hackers can do:

    • delete VPS — angry tickets from and refunds for managed clients, drama threads from unmanaged clients
    • create VPS — mine monero, send spam — your IP listed on Spamhaus
    • do naughty inside the VPS (see below)

    PHP-based shared hosting panels:

    • Plesk
    • ISPConfig
    • Froxlor

    What hackers can do:

    • delete files, deface website, wipe databases — angry tickets from and refunds for managed clients, drama threads from unmanaged clients

    These panels are not PHP based:

    • Billing: BILLmanager (C++)
    • Hypervisor: Proxmox VE (Perl), SolusIO (Go), OpenStack (Python)
    • Shared hosting: cPanel (Perl), DirectAdmin (C++), aaPanel (Python)

    You can escape PHP vulnerabilities, but they can have their own vulnerabilities.

    Research performed by Muse.ai, "what hackers can do" sections written by the flesh.

    Looks like Virtualizor/Softaculous shut down their websites.
    virtualizor emps runs on php 7.4

  • BAKABAKA Member

    I saw remi repo released patched version, but cdn hasn't updated yet. Brought down my php service for now.

  • LeviLevi Veteran

    Sury (debian and ubuntu) repo released backports for php 7.x. Though, cant find changelog for it.

  • DediRockDediRock Member, Patron Provider

    @neighhouse said:
    @NDTN cancel your meet with FAT32 and get patching my beloved.

    You too cuties @DediRock.

    And then calm our nerves by telling us you did.

    lol @neighhouse we definitely got the patch installed this am.

  • @DediRock said:

    @neighhouse said:
    @NDTN cancel your meet with FAT32 and get patching my beloved.

    You too cuties @DediRock.

    And then calm our nerves by telling us you did.

    lol @neighhouse we definitely got the patch installed this am.

    Absolute goats.

  • JabJabJabJab Veteran

    @Levi said: Sury (debian and ubuntu) repo released backports for php 7.x. Though, cant find changelog for it.

    Please, that guy even patched 5.6 :D
    Ondřej is cool.

    Thanked by 1yoursunny
  • LeviLevi Veteran

    @JabJab said:

    @Levi said: Sury (debian and ubuntu) repo released backports for php 7.x. Though, cant find changelog for it.

    Please, that guy even patched 5.6 :D
    Ondřej is cool.

    Yep, that guy is goat’ed af.

  • angstromangstrom Moderator, Veteran

    No love for php-4.4 users? (Or is php-4.4 not affected?)

  • yoursunnyyoursunny Member, IPv6 Advocate

    @angstrom said:
    No love for php-4.4 users? (Or is php-4.4 not affected?)

    No love for PHP 6.0 either.

    In 2008, I called up a shared hosting reseller asking whether they have PHP 4 or PHP 5, and I was told it’s “PHP 6”.

    Thanked by 1angstrom
  • raindog308raindog308 Administrator, Veteran

    @angstrom said: No love for php-4.4 users? (Or is php-4.4 not affected?)

    Insert php-selektor joke.

    Thanked by 1angstrom
  • defaultdefault Veteran

    @raindog308 said:

    @angstrom said: No love for php-4.4 users? (Or is php-4.4 not affected?)

    Insert php-selektor joke.

    I saw an ad for a php developer at Pornhub the other day. It was really attractive but I don't know if I could bring myself to admit before my friends and family that I do php

  • tuxtux Veteran

    @FAT32 you should update all idlers, if there are php installed

  • tomletomle LIR, Veteran

    @dustinc Shared hosting still runs unpatched, how can this be?

  • dustincdustinc Patron Provider, Top Host, Veteran

    @tomle said:
    @dustinc Shared hosting still runs unpatched, how can this be?

    Hi @tomle -- You'll find this to be the case for anyone running CloudLinux, which is almost every shared hosting provider nowadays. We're waiting on CloudLinux for the patched packages. All of our shared hosting servers run CloudLinux 9, where the ea-php* packages are supplied through CloudLinux's repositories. We're closely following their rollout here: https://cloudlinux.statuspage.io/incidents/zl0vt1yq3dj5

    We've been watching this very closely since yesterday, and have already implemented PHP configuration mitigations across all shared hosting servers -- including the recommended php.ini changes. All of our shared hosting servers also use cPGuard, and we now have its additional WAF protection in place. These rules are designed to inspect incoming multipart request headers and block known malicious patterns before they reach the PHP parser. More information on that here: https://www.opsshield.com/blog/php2shell-critical-vulnerabilities-cve-2026-109618-cve-2026-109619-mitigation-steps-and-cpguard-waf-protection/

    These protections help reduce exposure in the meantime, and we're actively monitoring the repositories and are ready to apply the updates as soon as CloudLinux makes them available.

  • tomletomle LIR, Veteran

    @dustinc said:

    @tomle said:
    @dustinc Shared hosting still runs unpatched, how can this be?

    Hi @tomle -- You'll find this to be the case for anyone running CloudLinux, which is almost every shared hosting provider nowadays. We're waiting on CloudLinux for the patched packages. All of our shared hosting servers run CloudLinux 9, where the ea-php* packages are supplied through CloudLinux's repositories. We're closely following their rollout here: https://cloudlinux.statuspage.io/incidents/zl0vt1yq3dj5

    We've been watching this very closely since yesterday, and have already implemented PHP configuration mitigations across all shared hosting servers -- including the recommended php.ini changes. All of our shared hosting servers also use cPGuard, and we now have its additional WAF protection in place. These rules are designed to inspect incoming multipart request headers and block known malicious patterns before they reach the PHP parser. More information on that here: https://www.opsshield.com/blog/php2shell-critical-vulnerabilities-cve-2026-109618-cve-2026-109619-mitigation-steps-and-cpguard-waf-protection/

    These protections help reduce exposure in the meantime, and we're actively monitoring the repositories and are ready to apply the updates as soon as CloudLinux makes them available.

    Thanks for addressing it so quickly.

  • dustincdustinc Patron Provider, Top Host, Veteran

    @tomle said:

    @dustinc said:

    @tomle said:
    @dustinc Shared hosting still runs unpatched, how can this be?

    Hi @tomle -- You'll find this to be the case for anyone running CloudLinux, which is almost every shared hosting provider nowadays. We're waiting on CloudLinux for the patched packages. All of our shared hosting servers run CloudLinux 9, where the ea-php* packages are supplied through CloudLinux's repositories. We're closely following their rollout here: https://cloudlinux.statuspage.io/incidents/zl0vt1yq3dj5

    We've been watching this very closely since yesterday, and have already implemented PHP configuration mitigations across all shared hosting servers -- including the recommended php.ini changes. All of our shared hosting servers also use cPGuard, and we now have its additional WAF protection in place. These rules are designed to inspect incoming multipart request headers and block known malicious patterns before they reach the PHP parser. More information on that here: https://www.opsshield.com/blog/php2shell-critical-vulnerabilities-cve-2026-109618-cve-2026-109619-mitigation-steps-and-cpguard-waf-protection/

    These protections help reduce exposure in the meantime, and we're actively monitoring the repositories and are ready to apply the updates as soon as CloudLinux makes them available.

    Thanks for addressing it so quickly.

    Hi @tomle -- no worries! Things are progressing based on CloudLinux's latest status update, though we're still waiting on the ea-php* packages. We've been in communication with their team, and they've told us they're actively working on these and targeting a release today.

    Looking at the cPanel forums too, other CloudLinux users appear to be in the same boat, waiting for those updates too.

    In the meantime, we have multiple layers of mitigation in place across our shared/reseller hosting servers, with most of these measures already in place since yesterday (well before any exploit script or PoC dropped). As @Daniel15 also touched on here, Apache environments appear to carry the highest risk. For context, all of our shared hosting servers run LiteSpeed Enterprise, and LiteSpeed has been very responsive throughout this entire ordeal as well. We've appreciated that from them.

    As I'm sure you can imagine, it's likely very much all hands on deck over at CloudLinux right now and I have no doubt that they are very much on it. We're staying in touch with their team, closely monitoring the releases, and applying the patches as they become available.

  • dustincdustinc Patron Provider, Top Host, Veteran

    Woot woot, CloudLinux ea-php* packages rolling out now as of ~4 minutes ago :) https://cloudlinux.statuspage.io/incidents/zl0vt1yq3dj5

  • raindog308raindog308 Administrator, Veteran

    @dustinc said: Looking at the cPanel forums too, other CloudLinux users appear to be in the same boat, waiting for those updates too.

    Huh...today I learned something new. I thought any PHP fix would come from cPanel but I guess there's CloudLinux + hardened-PHP in which case you get the fix from CloudLinux.

    I thought CloudLinux was just a special kernel/distro that had special features for per-account isolation but I guess they reach much further up the stack than I'd thought.

  • HostDZireHostDZire Patron Provider, Veteran

    @dustinc said:
    Woot woot, CloudLinux ea-php* packages rolling out now as of ~4 minutes ago :) https://cloudlinux.statuspage.io/incidents/zl0vt1yq3dj5

    Yeah they took their time :|
    I was also waiting whole day

  • @raindog308 said: I thought CloudLinux was just a special kernel/distro that had special features for per-account isolation but I guess they reach much further up the stack than I'd thought.

    They are a company focused on shared-hosting and as a result - hardened RHEL distro.
    All the downstream packages are obviously built by them, this is also why the bug bounty
    for compromising it is much higher than regular vanilla distros.

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