CVE-2026-28321: SolarWinds Serv-U is affected by a broken access control vulnerability that could allow arbitrary file read and write, which can then be used to escalate privileges and execute cod

criticalCVSS 9.1CVE-2026-28321

SolarWinds Serv-U is affected by a broken access control vulnerability that could allow arbitrary file read and write, which can then be used to escalate privileges and execute code as root. A domain administrator access is required, and the impact is lower in Windows installations.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: critical — CVSS 9.1
Published: 2026-07-21
Last updated: 2026-07-24
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-28321

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-283210.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-28321	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownNCSC-2026-0265 [1.00] [M/H] Vulnerabilities fixed in SolarWinds Serv-Uncsc-nl
high[NEW] [high] SolarWinds Serv-U: Multiple vulnerabilitiescert-bund

Recent advisories for SolarWinds Serv-U is

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownNCSC-2026-0265 [1.00] [M/H] Vulnerabilities fixed in SolarWinds Serv-Uncsc-nl · 2026-07-27
high[NEW] [high] SolarWinds Serv-U: Multiple vulnerabilitiescert-bund · 2026-07-22
criticalCVE-2026-28317: SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that…nvd · 2026-07-21
criticalCVE-2026-28316: SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that…nvd · 2026-07-21
mediumCVE-2026-28315: SolarWinds Serv-U was found to be affected by a stored cross-site scripting vulnerability that…nvd · 2026-07-21
criticalCVE-2026-28314: SolarWinds Serv-U is affected by an insecure direct object reference vulnerability that leads …nvd · 2026-07-21