CVE-2026-28321 — SolarWinds Serv-U Broken Access Control Vulnerability

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.

Published Jul 21, 2026Updated Jul 24, 2026Sources: cvelistV5, SolarWinds

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

chance of exploitation in 30 days

Affects

solarwinds

serv_u

CVSS base

9.1

CRITICAL

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Vendors (1)

solarwinds

Products (1)

serv u

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
9.1	CVSS 3.1	CRITICAL	—	—	cvelistV5

Weakness & attack patterns

CWE-284

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

T1027.009Obfuscated Files or Information: Embedded Payloads
T1546.004Event Triggered Execution: .bash_profile and .bashrc
T1546.016Event Triggered Execution: Installer Packages

References

2 on the record

www.solarwinds.com/trust-center/security-advisories/CVE-2026-28321
vendor-advisory
documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm
release-notes

Elsewhere on this site

solarwindsevery CVE for this vendor
CWE-284other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.