VulnerabilityAnalyzed

CVE-2026-28313

SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover.

CRITICAL 9.1EPSS 0.50%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

SolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.

CVSS 3.1: 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.50% probability · 41th percentile
CISA KEV: Not listed
Weakness: CWE-639
Affected: solarwinds/serv-u
Source: psirt@solarwinds.com

References

https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_release_notes.htmRelease Notes, Vendor Advisory
https://https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28313Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.