CVE-2026-40205

MEDIUMPre-NVD 5.95.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.9 from GitHub Security Advisory published 2026-08-28. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote token validation paths accept a token that carries only one of them, while the local token validation path correctly requires all of them. The configured authorization policy is not enforced, so a token that was granted only part of the required permissions is accepted where it should have been rejected. Use local token validation where tokens can be validated locally. Update to non-vulnerable version. No publicly available exploits are known.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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 (value × EchelonGraph’s weight)
Severity59% × 45%
The EG Score, 5.9 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
10th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
Patch available.
Web page
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

Vendor Advisories for CVE-2026-40205(1)

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

Affected Packages

(5 across 5 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot1:2.3.19.1+dfsg1-2.1 ... 1:2.4.5+dfsg1-3 (43 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.1+dfsg1-6+deb13u6 (7 versions)
  • every version up to 1:2.4.1+dfsg1-6+deb13u7: fixed in 1:2.4.1+dfsg1-6+deb13u7
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
dovecot1:2.4.1+dfsg1-6 ... 1:2.4.4+dfsg1-2 (12 versions)
  • every version up to 1:2.4.5+dfsg1-1: fixed in 1:2.4.5+dfsg1-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 76× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 129 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 30 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  3. 2026-10-12 16:09 UTCEG score recompute
  4. 2026-10-11 19:52 UTCEG score recompute
  5. 2026-10-11 17:05 UTCEG score recompute
  6. 2026-10-11 14:31 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-10 01:05 UTCEG score recompute
  10. 2026-10-10 01:05 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-10-09 02:42 UTCEG score recompute
  13. 2026-10-09 02:42 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-10-08 00:55 UTCEG score recompute
  16. 2026-10-08 00:54 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-06 16:10 UTCEG score recompute
  19. 2026-10-06 16:10 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  20. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-10-05 17:53 UTCEG score recompute
  22. 2026-10-05 17:53 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-10-04 19:36 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
Show 74 more
  1. 2026-10-03 21:16 UTCEG score recompute
  2. 2026-10-03 21:16 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  3. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-02 22:59 UTCEG score recompute
  5. 2026-10-02 22:58 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  6. 2026-10-02 00:37 UTCEG score recompute
  7. 2026-10-02 00:37 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  8. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  9. 2026-10-01 02:11 UTCEG score recompute
  10. 2026-10-01 02:11 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  11. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-09-30 03:52 UTCEG score recompute
  13. 2026-09-30 03:52 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  14. 2026-09-29 03:43 UTCEG score recompute
  15. 2026-09-29 03:43 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  16. 2026-09-28 05:19 UTCEG score recompute
  17. 2026-09-28 05:19 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-09-27 07:02 UTCEG score recompute
  20. 2026-09-27 07:02 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  21. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-09-26 08:44 UTCEG score recompute
  23. 2026-09-26 08:44 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  24. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-09-25 07:21 UTCEG score recompute
  26. 2026-09-25 07:21 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  27. 2026-09-24 09:04 UTCEG score recompute
  28. 2026-09-24 09:04 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  29. 2026-09-23 10:47 UTCEG score recompute
  30. 2026-09-23 10:47 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  31. 2026-09-22 12:23 UTCEG score recompute
  32. 2026-09-22 12:23 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  33. 2026-09-21 14:05 UTCEG score recompute
  34. 2026-09-21 14:05 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  35. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  36. 2026-09-20 15:48 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  37. 2026-09-19 17:28 UTCEG score recompute
  38. 2026-09-19 17:28 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  39. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  40. 2026-09-18 19:11 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  41. 2026-09-17 20:52 UTCEG score recompute
  42. 2026-09-17 20:52 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  43. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  44. 2026-09-16 19:13 UTCEG score recompute
  45. 2026-09-16 19:13 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  46. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  47. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  48. 2026-09-15 20:56 UTCEG score recompute
  49. 2026-09-15 20:56 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  50. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  51. 2026-09-14 22:27 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  52. 2026-09-14 00:10 UTCEG score recompute
  53. 2026-09-14 00:10 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  54. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  55. 2026-09-13 01:52 UTCEG score recompute
  56. 2026-09-13 01:52 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  57. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  58. 2026-09-12 03:34 UTCEG score recompute
  59. 2026-09-12 03:34 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  60. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  61. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  62. 2026-09-11 05:17 UTCEG score recompute
  63. 2026-09-11 05:17 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  64. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  65. 2026-09-10 07:00 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  66. 2026-09-09 08:43 UTCEG score recompute
  67. 2026-09-09 08:43 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  68. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  69. 2026-09-08 10:26 UTCEG score recompute
  70. 2026-09-08 10:25 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  71. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  72. 2026-09-07 11:31 UTCEG score recompute
  73. 2026-09-07 11:31 UTCGHSA enrichmentGHSA-8rjh-g9p7-rx87 · GitHub CVSS 5.9
  74. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-40205?
CVE-2026-40205 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote token validation paths accept a token that carries only one of them, while the local token validation path correctly…
When was the CVE record for CVE-2026-40205 published?
The CVE record for CVE-2026-40205 was published on August 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 3, 2026; the record at its source may have been updated since.
Is CVE-2026-40205 actively exploited?
CVE-2026-40205 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40205?
CVE-2026-40205 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-40205?
A fix for CVE-2026-40205 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-40205 are linked in the Vendor Advisories panel on this page.

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