MSRXVulnerabilities / CVE-2025-26399
CVE-2025-26399
Published 2025-09-23 · Analyzed
CVE-2025-26399
SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-03-09, with a fix-by date of 2026-03-12. Patch it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
9.8 CRITICAL
CVSS 3.1 · CNA · solarwinds.com
CVSS 3.1 · CNA · solarwinds.com
90%
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Scores
Affected products
- solarwinds web help desk: ≤ 12.8.6; 12.8.7
Weakness: CWE-502
4 references (advisories, patches, write-ups)
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm · Release Notes
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399 · Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399 · US Government Resource
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/ · Third Party Advisory
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.