--- title: "cPanel Security Patch Coming September 29, 2026: Severity Up to Critical" description: "cPanel has notified partners of a cPanel security patch expected Tuesday, September 29, 2026, addressing multiple vulnerabilities across cPanel & WHM (Web Host Manager) with severity rated up to Criti..." url: https://www.inmotionhosting.com/support/news/2026-cpanel-security-response/september-29-patch/ date: 2026-09-28 modified: 2026-09-28 author: "Derrell" categories: ["2026 cPanel Security Response"] type: post lang: en --- # cPanel Security Patch Coming September 29, 2026: Severity Up to Critical TL;DR (AI Generated) . cPanel has notified partners of a cPanel security patch expected Tuesday, September 29, 2026, addressing multiple vulnerabilities across cPanel & WHM (Web Host Manager) with severity rated up to Critical. cPanel has not shared a release time. cPanel reports no known exploits or proof-of-concept code in the wild at this time. According to cPanel, outside security researchers responsibly disclosed some of the vulnerabilities being patched, while cPanel's own security team found others internally. cPanel will release technical details, including Common Vulnerabilities and Exposures (CVE) identifiers, alongside the patches, not before. If the line in is pinned to a specific build number, or to a version below 110, check with cPanel or our Technical Support team before updating. cPanel strongly recommends a cPanel-provided release tier (LTS, STABLE, RELEASE, CURRENT, or EDGE) instead of a fixed build number, because custom version numbers often become out of date. Basic summary cPanel has notified partners of a **cPanel security patch** expected Tuesday, September 29, 2026, addressing multiple vulnerabilities across cPanel & WHM (Web Host Manager) with severity rated up to Critical. cPanel has not shared a release time. cPanel reports no known exploits or proof-of-concept code in the wild at this time. InMotion Hosting will apply the cPanel security patch to Shared, Reseller, and WordPress Hosting servers once it is available, so customers on those plans do not need to take any action. Customers with root access on a VPS or Dedicated server should read on for the update path. ## What We Know About the cPanel Security Patch According to cPanel, outside security researchers responsibly disclosed some of the vulnerabilities being patched, while cPanel’s own security team found others internally. cPanel will release technical details, including Common Vulnerabilities and Exposures (CVE) identifiers, alongside the patches, not before. The exact number and nature of the issues are not public yet. cPanel distributes the patch through its standard automatic update process and its manual update process. It strongly recommends a manual update once the build is available for your server’s release tier. The patch affects cPanel & WHM versions 110 and later. cPanel has not published patched build numbers for each version yet. **Note:** This patch is separate from the [targeted cPanel security release from September 22, 2026](/support/news/2026-cpanel-security-response/cpanel-security-release-september-2026/), which InMotion Hosting began applying that day. InMotion Hosting will update this article with confirmed patched build numbers, CVE identifiers, and a link to cPanel’s official advisory once cPanel publishes them. ## What This Means for Your Hosting ### Shared, Reseller, and WordPress Hosting These plans run on InMotion Hosting’s cPanel Long Term Support (LTS) tier. InMotion Hosting manages cPanel updates on these servers, so you do not need to do anything. InMotion Hosting will apply the patch across these servers once cPanel releases it. The rollout reaches servers in stages, so your account may update at a different time than others. ### VPS and Dedicated servers InMotion Hosting does not push this patch to VPS or Dedicated servers. Most InMotion Hosting VPS and Dedicated servers follow cPanel’s RELEASE tier, not LTS, and receive updates through the nightly `upcp` cron job by default. If you have not disabled or pinned updates, your server will pick up the new build on its own after cPanel releases it. If you have root or WHM access and manage your own update settings, plan to run a manual update once the patch is available. Do not wait for the next scheduled cron run. If you have a Managed VPS or Managed Dedicated server, our Technical Support and Advanced Product Support teams can review your update configuration and apply the patch for you. Reach out through your [Account Management Panel (AMP)](https://secure1.inmotionhosting.com/amp) to request help. ## What You Should Do If you manage your own VPS or Dedicated server, check your current cPanel & WHM version now so you can confirm the update applied later. Log in over [Secure Shell (SSH)](/support/server/ssh/how-to-login-ssh/) or open WHM’s Terminal interface as root, then run: ``` /usr/local/cpanel/cpanel -V ``` Once cPanel releases the patch, run the following command as root to apply it manually: ``` /scripts/upcp ``` Do not run `/scripts/upcp` before cPanel releases the patch. The patched build will not be available until then. Run `/usr/local/cpanel/cpanel -V` again afterward to confirm the build number changed. **Important:** `/scripts/upcp` installs the most recent build available on your server’s configured release tier. If the `CPANEL=` line in `/etc/cpupdate.conf` is pinned to a specific build number, or to a version below 110, check with cPanel or our Technical Support team before updating. cPanel strongly recommends a cPanel-provided release tier (LTS, STABLE, RELEASE, CURRENT, or EDGE) instead of a fixed build number, because custom version numbers often become out of date. ## What Comes Next cPanel has said it will publish full technical details alongside the patch. InMotion Hosting will update this article with the confirmed patched build numbers for every affected version, the CVE identifiers, and a link to cPanel’s official advisory once cPanel publishes them. In the meantime, you can track build numbers as they post on the official [cPanel & WHM changelogs](https://docs.cpanel.net/changelogs/). 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