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ExploitedIn CISA KEVFix available

CVE-2026-59310

vCenter directory-traversal vulnerability

Exploitation confirmed. First attested on 2026-08-10 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · kevintel.

  • Published2026-07-30
  • Fixed in9.1.0.0300 · 9.0.2.0100 · 8.0
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with network access to vCenter may exploit this issue to execute arbitrary code.

Timeline

dates in UTC
  1. 2026-07-3013:16CVE publishedNVD
  2. 2026-08-10Listed as exploited by GCVEGCVE
  3. 2026-08-10Exploitation first reportedGCVE
  4. 2026-08-18Added to the CISA KEV catalogCISA KEV
  5. 2026-08-1817:44SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-10-28 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-59310?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-59310?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Vmware vcenter serverversion to verify
BranchAffectedFixed in
9.1≥ 9.1, < 9.1.0.03009.1.0.0300
9.0≥ 9.0, < 9.0.2.01009.0.2.0100
8.0< 8.08.0
8.0= 8.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Vmware vcenter server to 9.1.0.0300 · 9.0.2.0100 · 8.0
  2. 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). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-08-21

Advisories and patches

Detection

read 2026-10-28 00:45 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
5 repositories, unverifiedHORKimhab/CVE-2026-59310BiuTrap/CVE-2026-59310zgsfsec/CVE-2026-59310-POCvpxuser/CVE-2026-59310chu0119/vc-strike
PoC-in-GitHub

CISA Known Exploited Vulnerability

Date Added
2026-08-18
Patch Due Date
2026-08-21
Ransomware Use
Unknown
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). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-30
Last Modified
2026-08-18
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-59310?

VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with network access to vCenter may exploit this issue to execute arbitrary code.

Is CVE-2026-59310 actively exploited?

Yes. CVE-2026-59310 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-08-21.

What is the CVSS score for CVE-2026-59310?

CVE-2026-59310 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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