CVE-2026-41940
CVE-2026-41940 is a security flaw in WebPros cPanel & WHM and WP2 (WordPress Squared). Attackers can get into WebPros cPanel & WHM and WP2 (WordPress Squared) without a valid password. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 30 Apr 2026, and says ransomware gangs have used it.[1]
WebPros cPanel & WHM and WP2 (WordPress Squared) is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fixed in version 11.86.0.41, 11.94.0.28, 11.102.0.39 and 11.110.0.97 and others of cPanel.
Description
CISA calls it a missing authentication for critical function in WebPros cPanel & WHM and WP2 (WordPress Squared). In its words: “WebPros cPanel & WHM (WebHost Manager) and WP2 (WordPress Squared) contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.”[1]
The underlying weakness is missing authentication (CWE-306), in MITRE’s list of common software weaknesses.[2]
It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record lists these fixed versions: in each line, everything before the version shown is affected.[2]
| Product | Fixed in |
|---|---|
| cPanel | 11.86.0.41 |
| cPanel | 11.94.0.28 |
| cPanel | 11.102.0.39 |
| cPanel | 11.110.0.97 |
| cPanel | 11.118.0.63 |
| cPanel | 11.124.0.35 |
| cPanel | 11.126.0.54 |
| cPanel | 11.130.0.19 |
Most families won’t have WebPros cPanel & WHM and WP2 (WordPress Squared); it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 30 Apr 2026, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 3 May 2026 to fix it.[1] CISA says ransomware gangs have used it.
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 99%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
WebPros has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.WebPros cPanel & WHM and WP2 (WordPress Squared) is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed (fixed in version 11.86.0.41, 11.94.0.28, 11.102.0.39 and 11.110.0.97 and others of cPanel), or not in use. CISA gave US government agencies until 3 May 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks, noting that ransomware gangs have used it.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 99%.[4] |
See also
Other missing authentication flaws
- CVE-2026-111357, Ivanti Connect Secure: missing authentication for critical function ·
- CVE-2026-67277, MikroTik RouterOS: missing authentication for critical function ·
- CVE-2026-81578, PaperCut NG/MF: missing authentication for critical function ·
- CVE-2026-72529, TrueConf Server: missing authentication for critical function ·
- CVE-2026-56164, Microsoft SharePoint Server: missing authentication for critical function ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “WebPros cPanel & WHM and WP2 (WordPress Squared) Missing Authentication for Critical Function Vulnerability”. Known Exploited Vulnerabilities Catalog, added 30 Apr 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-41940 Detail”. National Vulnerability Database, published 29 Apr 2026.
- ^ WebPros. Advisories and fixes: support.cpanel.net, docs.cpanel.net, docs.wpsquared.com, docs.cpanel.net.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.985, percentile 99.9, 31 Oct 2026.
- CVE Program. “CVE-2026-41940”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.