# CVE-2026-28308 — SolarWinds Serv-U

> As of 2026-07-24, CVE-2026-28308 is a CRITICAL-severity vulnerability in SolarWinds Serv-U, CVSS v3.1 9.1, EPSS 0.7% (54.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-28308, most recently “SolarWinds Serv-U 2026.3 Patches 16 Vulnerabilities (CVE-2026-28302 to CVE-2026-28321) Including Root RCE, IDOR-Chained Privilege Escalation, and Broken Access Control”.

**Last updated:** 2026-07-24

## What is CVE-2026-28308?

SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to remote code execution. Domain administrator access is required. The impact is lower in Windows deployments.

The record classifies CVE-2026-28308 under weakness class [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 99 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.7% probability of exploitation in the next 30 days, higher than 54.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-21, last modified 2026-07-24

## Is CVE-2026-28308 being exploited?

It currently carries a trending score of 28 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [SolarWinds](https://intel.threadlinqs.com/vendors/solarwinds): Serv-U

## How to fix CVE-2026-28308

No vendor patch reference has been recorded for CVE-2026-28308 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-28308

1 tracked threat in the Threadlinqs corpus references CVE-2026-28308, either in the campaign’s CVE list or as an indicator on the campaign record.

- [SolarWinds Serv-U 2026.3 Patches 16 Vulnerabilities (CVE-2026-28302 to CVE-2026-28321) Including Root RCE, IDOR-Chained Privilege Escalation, and Broken Access Control](https://intel.threadlinqs.com/threat/TL-2026-1625) — CRITICAL · 2026-07-22

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [solarwinds.com — vendor advisory](https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28308)

**Other references**

- [documentation.solarwinds.com](https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htm)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-28308
Full detection coverage and IOCs for threats exploiting CVE-2026-28308 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp