CVE-2026-54203

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 75% 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, secondary
Trending — 3 sources updated this week
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.2Exploit: None knownExposed: 0

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

Memory Leak to an Unauthorized Actor vulnerability in Tobit Laboratories AG TeamDavid's Webbox allows reading of sensitive information. When accessing the URL “/.well-known/mta-sts.”, the application responds with memory. By repeatedly requesting this endpoint, an attacker can access sensitive information, including user passwords. Exploitation does not require authentication. This issue affects TeamDavid through Rollout 524.

CVSS v3
9.2
EG Score
9.2(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity92% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 7, 2026

Last Modified

August 10, 2026

Advisory Details (2)

Auto-updated Aug 7, 2026
No patch confirmed yet.
generic

22 CVEs in TeamDavid® a "secure" M365 alternative - InfoGuard Labs

https://labs.infoguard.ch/posts/22-cves-in-david-a-secure-m365-alternative/
generic

Release Notes | TeamDavid

https://david.tobit.software/releasenotes

Vendor Advisories for CVE-2026-54203(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 116× 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 116 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-54203?
CVE-2026-54203 is a critical vulnerability published on August 7, 2026. Memory Leak to an Unauthorized Actor vulnerability in Tobit Laboratories AG TeamDavid's Webbox allows reading of sensitive information. When accessing the URL “/.well-known/mta-sts.”, the application responds with memory. By repeatedly requesting this endpoint, an attacker can access sensitive…
When was CVE-2026-54203 disclosed?
CVE-2026-54203 was first published in the National Vulnerability Database on August 7, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54203 actively exploited?
CVE-2026-54203 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 75.1% of all scored CVEs.
What is the CVSS score of CVE-2026-54203?
CVE-2026-54203 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-54203?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54203, 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.

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