CVE-2026-9129

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.4Exploit: None knownExposed: 0

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

A path traversal vulnerability exists in the Altium Enterprise Server Viewer StorageController due to improper handling of file path route parameters. On on-premise deployments that use local filesystem storage, a regular authenticated user can supply a URL-encoded absolute path (such as an encoded drive letter) in a Viewer storage API request, causing the configured storage root to be discarded and allowing arbitrary files to be read from the server filesystem.

Because the readable files include the server's master configuration, which stores database credentials, signing key locations, certificate passwords, and OAuth secrets, exploitation can lead to disclosure of all server secrets and full compromise of the server and its data. Cloud deployments are not affected, as they use object storage and do not enable this component.

CVSS v3
9.4
EG Score
9.4(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

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
Severity94% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

May 20, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Security Advisories | Altium

https://www.altium.com/platform/security-compliance/security-advisories

Vendor Advisories for CVE-2026-9129(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 31× 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 310 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-9129?
CVE-2026-9129 is a critical vulnerability published on May 20, 2026. A path traversal vulnerability exists in the Altium Enterprise Server Viewer StorageController due to improper handling of file path route parameters. On on-premise deployments that use local filesystem storage, a regular authenticated user can supply a URL-encoded absolute path (such as an encoded…
When was CVE-2026-9129 disclosed?
CVE-2026-9129 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9129 actively exploited?
CVE-2026-9129 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.7% of all scored CVEs.
What is the CVSS score of CVE-2026-9129?
CVE-2026-9129 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-9129?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9129, 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

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