CVE-2025-26399

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-03-09), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 88%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
99.8%
KEV
⚠ Exploited

Published

September 23, 2025

Last Modified

March 10, 2026

Advisory Details (4)

Auto-updated May 30, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
generic

Analysis of active exploitation of SolarWinds Web Help Desk | Microsoft Security Blog

https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
generic

SolarWinds Trust Center Security Advisories | CVE-2025-26399 | SolarWinds

https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
generic

WHD 12.8.7 hotfix 1 release notes

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 37× in last 7d / 192× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 377 total refreshes for this CVE.

  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 02:51 UTCEG score recompute
  3. 2026-07-23 00:26 UTCEG score recompute
  4. 2026-07-23 00:26 UTCGHSA enrichment
  5. 2026-07-22 20:15 UTCGHSA enrichment
  6. 2026-07-22 19:40 UTCCISA KEV update
  7. 2026-07-22 16:05 UTCEG score recompute
  8. 2026-07-22 16:04 UTCGHSA enrichment
  9. 2026-07-22 14:07 UTCEPSS rescore
  10. 2026-07-22 14:07 UTCEPSS rescore
  11. 2026-07-22 11:50 UTCGHSA enrichment
  12. 2026-07-22 07:40 UTCGHSA enrichment
  13. 2026-07-22 03:30 UTCGHSA enrichment
  14. 2026-07-21 23:18 UTCGHSA enrichment
  15. 2026-07-21 18:27 UTCGHSA enrichment
  16. 2026-07-21 14:37 UTCCISA KEV update
  17. 2026-07-21 14:17 UTCGHSA enrichment
  18. 2026-07-21 10:06 UTCGHSA enrichment
  19. 2026-07-21 05:56 UTCGHSA enrichment
  20. 2026-07-21 01:46 UTCGHSA enrichment
  21. 2026-07-20 21:35 UTCGHSA enrichment
  22. 2026-07-20 17:26 UTCGHSA enrichment
  23. 2026-07-20 13:16 UTCGHSA enrichment
  24. 2026-07-20 09:06 UTCGHSA enrichment
  25. 2026-07-20 04:55 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 20:36 UTCGHSA enrichment
  2. 2026-07-19 16:26 UTCEG score recompute
  3. 2026-07-19 16:26 UTCGHSA enrichment
  4. 2026-07-19 14:30 UTCEPSS rescore
  5. 2026-07-19 14:30 UTCEPSS rescore
  6. 2026-07-19 12:16 UTCGHSA enrichment
  7. 2026-07-19 08:07 UTCGHSA enrichment
  8. 2026-07-19 03:57 UTCGHSA enrichment
  9. 2026-07-18 23:47 UTCGHSA enrichment
  10. 2026-07-18 19:37 UTCGHSA enrichment
  11. 2026-07-18 15:27 UTCGHSA enrichment
  12. 2026-07-18 11:17 UTCGHSA enrichment
  13. 2026-07-18 07:07 UTCGHSA enrichment
  14. 2026-07-18 02:57 UTCGHSA enrichment
  15. 2026-07-17 22:47 UTCGHSA enrichment
  16. 2026-07-17 18:37 UTCGHSA enrichment
  17. 2026-07-17 14:27 UTCGHSA enrichment
  18. 2026-07-17 10:17 UTCEG score recompute
  19. 2026-07-17 10:17 UTCGHSA enrichment
  20. 2026-07-17 06:07 UTCGHSA enrichment
  21. 2026-07-17 01:57 UTCGHSA enrichment
  22. 2026-07-16 21:46 UTCGHSA enrichment
  23. 2026-07-16 17:37 UTCGHSA enrichment
  24. 2026-07-16 17:04 UTCCISA KEV update
  25. 2026-07-16 17:02 UTCEPSS rescore
  26. 2026-07-16 13:27 UTCGHSA enrichment
  27. 2026-07-16 09:17 UTCGHSA enrichment
  28. 2026-07-16 05:08 UTCGHSA enrichment
  29. 2026-07-16 00:58 UTCGHSA enrichment
  30. 2026-07-15 20:47 UTCGHSA enrichment
  31. 2026-07-15 16:57 UTCEPSS rescore
  32. 2026-07-15 16:57 UTCEPSS rescore
  33. 2026-07-15 16:49 UTCCISA KEV update
  34. 2026-07-15 16:37 UTCGHSA enrichment
  35. 2026-07-15 15:04 UTCCISA KEV update
  36. 2026-07-15 12:26 UTCGHSA enrichment
  37. 2026-07-15 08:17 UTCGHSA enrichment
  38. 2026-07-15 04:06 UTCGHSA enrichment
  39. 2026-07-14 23:56 UTCGHSA enrichment
  40. 2026-07-14 19:46 UTCGHSA enrichment
  41. 2026-07-14 18:05 UTCCISA KEV update
  42. 2026-07-14 15:36 UTCGHSA enrichment
  43. 2026-07-14 11:25 UTCGHSA enrichment
  44. 2026-07-14 07:15 UTCGHSA enrichment
  45. 2026-07-14 03:05 UTCGHSA enrichment
  46. 2026-07-13 22:56 UTCGHSA enrichment
  47. 2026-07-13 18:46 UTCGHSA enrichment
  48. 2026-07-13 17:07 UTCCISA KEV update
  49. 2026-07-13 14:36 UTCGHSA enrichment
  50. 2026-07-13 10:26 UTCGHSA enrichment
  51. 2026-07-13 06:16 UTCGHSA enrichment
  52. 2026-07-13 06:12 UTCEPSS rescore
  53. 2026-07-13 06:12 UTCEPSS rescore
  54. 2026-07-13 02:05 UTCGHSA enrichment
  55. 2026-07-12 21:55 UTCGHSA enrichment
  56. 2026-07-12 17:45 UTCGHSA enrichment
  57. 2026-07-12 13:35 UTCGHSA enrichment
  58. 2026-07-12 09:26 UTCGHSA enrichment
  59. 2026-07-12 05:16 UTCGHSA enrichment
  60. 2026-07-12 01:05 UTCGHSA enrichment
  61. 2026-07-11 20:55 UTCGHSA enrichment
  62. 2026-07-11 16:45 UTCGHSA enrichment
  63. 2026-07-11 12:35 UTCGHSA enrichment
  64. 2026-07-11 08:25 UTCGHSA enrichment
  65. 2026-07-11 04:15 UTCGHSA enrichment
  66. 2026-07-11 00:05 UTCGHSA enrichment
  67. 2026-07-10 19:54 UTCGHSA enrichment
  68. 2026-07-10 17:52 UTCCISA KEV update
  69. 2026-07-10 15:44 UTCGHSA enrichment
  70. 2026-07-10 11:33 UTCGHSA enrichment
  71. 2026-07-10 07:20 UTCGHSA enrichment
  72. 2026-07-10 03:09 UTCGHSA enrichment
  73. 2026-07-09 22:59 UTCGHSA enrichment
  74. 2026-07-09 18:49 UTCGHSA enrichment
  75. 2026-07-09 14:39 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCrxerium/CVE-2025-26399
    First seen Sep 23, 2025

    Detection for CVE-2025-26399

    Open source ↗

Frequently asked(6)

What is CVE-2025-26399?
CVE-2025-26399 is a critical vulnerability published on September 23, 2025. 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…
When was CVE-2025-26399 disclosed?
CVE-2025-26399 was first published in the National Vulnerability Database on September 23, 2025, with the most recent update on March 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-26399 actively exploited?
Yes. CISA added CVE-2025-26399 to the Known Exploited Vulnerabilities catalog on March 9, 2026, affecting SolarWinds Web Help Desk. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-26399?
CVE-2025-26399 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2025-26399?
CVE-2025-26399 affects SolarWinds Web Help Desk. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-26399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-26399, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-26399

Explore →

Is Your Infrastructure Affected by CVE-2025-26399?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs