CVE-2026-43638

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-05-11. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via POST /ciphers/import-organization by submitting an empty collections array, which causes the server-side permission check to be skipped.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

May 11, 2026

Last Modified

July 14, 2026

Advisory Details (5)

Auto-updated May 16, 2026
No patch confirmed yet.
generic

Bitwarden Server < 2026.4.1 Missing Authorization via Organization Cipher Import | Advisories | VulnCheck

https://www.vulncheck.com/advisories/bitwarden-server-missing-authorization-via-organization-cipher-import
generic

Sanjok Karki | Offensive Security Engineer

https://sanjokkarki.com.np/blog/bitwarden-import-org-bypass
generic

Release Version 2026.4.1 · bitwarden/server · GitHub

https://github.com/bitwarden/server/releases/tag/v2026.4.1
generic

[PM-34383] Add import validation allowing providers to perform imports by harr1424 · Pull Request #7394 · bitwarden/server · GitHub

https://github.com/bitwarden/server/pull/7394
generic

[PM-34383] Add import validation allowing providers to perform import… · bitwarden/server@ebbf6dd · GitHub

https://github.com/bitwarden/server/commit/ebbf6dd0fa752114c09d73abb48ce32a50476758

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 36× 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 115 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-43638?
CVE-2026-43638 is a medium vulnerability published on May 11, 2026. Bitwarden Server prior to v2026.4.1 contains a missing authorization vulnerability that allows any authenticated user to write ciphers into an arbitrary organization via POST /ciphers/import-organization by submitting an empty collections array, which causes the server-side permission check to be…
When was CVE-2026-43638 disclosed?
CVE-2026-43638 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43638 actively exploited?
CVE-2026-43638 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 91.3% of all scored CVEs.
What is the CVSS score of CVE-2026-43638?
CVE-2026-43638 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-43638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43638, 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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