Is CVE-2025-26399 in the CISA KEV catalog?

Yes. CVE-2025-26399 is on the CISA Known Exploited Vulnerabilities list, added 2026-03-09.

What is the CVSS severity of CVE-2025-26399?

CVE-2025-26399 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-26399?

CVE-2025-26399 has an EPSS score of 88.33% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2025-26399?

No published fix for CVE-2025-26399 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2026-03-12. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2025-26399

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.

CWE-502Deserialization of Untrusted Data

How to fix

Actively exploited, no published fix found yet

Federal remediation due: 2026-03-12

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

88.33%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-03-12

References

Patch1

solarwinds.com

Third-Party Advisory1

microsoft.com

Government Resource1

cisa.gov

Release Notes1

documentation.solarwinds.com

Related Vulnerabilities

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-0669	High	7.2	100%	KEV + Ransom	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-35464	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-29300	Critical	9.8	100%	KEV + Ransom	-
CVE-2025-53770	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2022-41082	High	8.0	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-10.