CVE-2026-18990

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory published 2026-08-06. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

A vulnerability was detected in letta-ai LettaBot 0.2.0. Impacted is an unknown function of the file src/api/server.ts of the component API Status Route. The manipulation results in missing authentication. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
64(Attend)
EG Risk 64/100SSVC: Attend

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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

lettabot: Unauthenticated access to portal management endpoints in shared mode exposes LettaBot pairing and agent status metadata · GitHub

https://gist.github.com/YLChen-007/2ba2e586f3d16cb368c8dcd6ef680178

Vendor Advisories for CVE-2026-18990(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 28× in last 7d / 64× 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.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:13 UTCGHSA enrichment
  3. 2026-08-20 08:19 UTCGHSA enrichment
  4. 2026-08-19 20:25 UTCEG score recompute
  5. 2026-08-19 20:25 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 08:26 UTCGHSA enrichment
  8. 2026-08-18 20:32 UTCEG score recompute
  9. 2026-08-18 20:32 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 08:38 UTCGHSA enrichment
  12. 2026-08-17 20:08 UTCEG score recompute
  13. 2026-08-17 20:07 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 08:10 UTCGHSA enrichment
  16. 2026-08-16 20:17 UTCEG score recompute
  17. 2026-08-16 20:17 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 08:23 UTCEG score recompute
  20. 2026-08-16 08:23 UTCGHSA enrichment
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 20:29 UTCGHSA enrichment
  23. 2026-08-15 08:35 UTCEG score recompute
  24. 2026-08-15 08:35 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 39 more
  1. 2026-08-14 20:41 UTCGHSA enrichment
  2. 2026-08-14 08:48 UTCEG score recompute
  3. 2026-08-14 08:48 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 20:54 UTCGHSA enrichment
  6. 2026-08-13 09:00 UTCGHSA enrichment
  7. 2026-08-12 21:07 UTCEG score recompute
  8. 2026-08-12 21:07 UTCGHSA enrichment
  9. 2026-08-12 13:50 UTCEPSS rescore
  10. 2026-08-12 09:14 UTCGHSA enrichment
  11. 2026-08-11 21:20 UTCEG score recompute
  12. 2026-08-11 21:20 UTCGHSA enrichment
  13. 2026-08-11 13:42 UTCEPSS rescore
  14. 2026-08-11 09:27 UTCEG score recompute
  15. 2026-08-11 09:27 UTCGHSA enrichment
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 21:33 UTCGHSA enrichment
  18. 2026-08-10 09:39 UTCGHSA enrichment
  19. 2026-08-09 21:46 UTCEG score recompute
  20. 2026-08-09 21:46 UTCGHSA enrichment
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-09 09:52 UTCGHSA enrichment
  23. 2026-08-08 21:59 UTCGHSA enrichment
  24. 2026-08-08 10:05 UTCGHSA enrichment
  25. 2026-08-07 22:12 UTCEG score recompute
  26. 2026-08-07 22:12 UTCGHSA enrichment
  27. 2026-08-07 10:18 UTCEG score recompute
  28. 2026-08-07 10:18 UTCGHSA enrichment
  29. 2026-08-06 22:24 UTCEG score recompute
  30. 2026-08-06 22:24 UTCGHSA enrichment
  31. 2026-08-06 22:18 UTCNVD updateCVSS v4 → 5.5
  32. 2026-08-06 22:15 UTCMITRE cvelistV5CVSS v4 → 6.9
  33. 2026-08-06 15:17 UTCEG score recompute
  34. 2026-08-06 15:17 UTCGHSA enrichment
  35. 2026-08-06 13:46 UTCEPSS rescore
  36. 2026-08-06 03:23 UTCEG score recompute
  37. 2026-08-06 03:23 UTCNVD updateCVSS v4 → 5.5
  38. 2026-08-06 03:15 UTCEG score recompute
  39. 2026-08-06 03:15 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18990?
CVE-2026-18990 is a high vulnerability published on August 6, 2026. A vulnerability was detected in letta-ai LettaBot 0.2.0. Impacted is an unknown function of the file src/api/server.ts of the component API Status Route. The manipulation results in missing authentication. The attack may be performed from remote. The exploit is now public and may be used. The…
When was CVE-2026-18990 disclosed?
CVE-2026-18990 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18990 actively exploited?
CVE-2026-18990 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 66.9% of all scored CVEs.
What is the CVSS score of CVE-2026-18990?
CVE-2026-18990 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-18990?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18990, 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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