CVE-2026-59310
CVE-2026-59310 is a security flaw in Broadcom VMware vCenter. Attackers can run their own code on Broadcom VMware vCenter. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 18 Aug 2026, and says ransomware gangs have used it.[1]
Broadcom VMware vCenter 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 9.1.0.0300, 9.0.2.0100 and 8.0 U3k of vCenter.
Description
CISA calls it a path traversal in Broadcom VMware vCenter. In its words: “Broadcom VMware vCenter contains a path traversal vulnerability which could allow a threat actor with network access to vCenter to execute arbitrary code.”[1]
The underlying weakness is path traversal (CWE-22), 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 |
|---|---|
| vCenter | 9.1.0.0300 |
| vCenter | 9.0.2.0100 |
| vCenter | 8.0 U3k |
Most families won’t have Broadcom VMware vCenter; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 18 Aug 2026, 19 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 21 Aug 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 3%. That’s in the top 15% 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
Broadcom has published a fix or advice.[3] CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]
- Check whether you use it.Broadcom VMware vCenter 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 9.1.0.0300, 9.0.2.0100 and 8.0 U3k of vCenter), or not in use. CISA gave US government agencies until 21 Aug 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 3%.[4] |
See also
Other Broadcom flaws
- CVE-2026-41709, Broadcom VMware ESX: insufficient logging ·
- CVE-2026-22719, Broadcom VMware Aria Operations: command injection ·
- CVE-2024-37079, Broadcom VMware vCenter Server: out-of-bounds write ·
- CVE-2025-41244, Broadcom VMware Aria Operations and VMware Tools: privilege defined with unsafe actions ·
- CVE-2025-1976, Broadcom Brocade Fabric OS: code injection ·
Other path traversal flaws
- CVE-2025-61624, Fortinet products: path traversal ·
- CVE-2021-3199, ONLYOFFICE Docs: server path traversal ·
- CVE-2026-104286, Fortinet FortiMail: path traversal ·
- CVE-2026-93616, Check Point products: path traversal ·
- CVE-2026-66384, JFrog Artifactory: improper limitation of a pathname to a restricted directory ·
Added the same day
- CVE-2026-65400, Apple macOS: improper authentication ·
- CVE-2026-55040, Microsoft SharePoint: weak authentication ·
- CVE-2026-33824, Microsoft Internet Key Exchange (IKE) Service Extensions: double free ·
Every Broadcom flaw on CISA’s list · Everything added in August 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Broadcom VMware vCenter Path Traversal Vulnerability”. Known Exploited Vulnerabilities Catalog, added 18 Aug 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-59310 Detail”. National Vulnerability Database, published 30 Jul 2026.
- ^ Broadcom. Advisories and fixes: support.broadcom.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.026, percentile 85.1, 31 Oct 2026.
- CVE Program. “CVE-2026-59310”. 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.