CVE-2026-55860

MEDIUMPre-NVD 5.95.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (12th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
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.

MariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb does not gate clear-text password authentication plugins on transport encryption because the AuthenticationPlugin interface has no capability for a plugin to require a secure connection. A hostile or man-in-the-middle MariaDB server can send an AuthSwitchRequest naming mysql_clear_password or dialog (PAM) over a plain-TCP unencrypted connection, and AuthenticationFlow permits ClearPasswordPluginFlow or PamPluginFlow to return the user's password as cleartext bytes on the wire. The disclosed credentials can subsequently be used to authenticate directly to the database server. This issue is fixed in version 1.4.1.

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
12th
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 8, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
Patch available. Sources: github_release, github, github_commit.
Web page

[R2DBC-115] Cleartext password leak for MiTm server - Jira

https://jira.mariadb.org/browse/R2DBC-115
GitHub release Patch Available

MariaDB Connector/R2DBC 1.4.1

Patch available: mariadb-corporation/mariadb-connector-r2dbc 1.4.1

https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1
GitHub commit Patch Available

commit be786603ec55 (mariadb-corporation/mariadb-connector-r2dbc)

Patch available: mariadb-corporation/mariadb-connector-r2dbc 1.4.1 (contains commit be786603ec55)

https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a
GitHub advisoryMentions a patch (unverified)

Cleartext password disclosure to a man-in-the-middle server (clear-text auth plugins not gated on a secure transport) · Advisory · mariadb-corporation/mariadb-connector-r2dbc · GitHub

Affected: 1.4.1. Clear-text authentication plugins (mysql_clear_password, dialog/PAM) now r

https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2

Vendor Advisories for CVE-2026-55860(1)

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

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.mariadb:r2dbc-mariadb0.8.1-alpha1 ... 1.4.0 (20 versions)
  • every version up to 1.4.1: fixed in 1.4.1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 56× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-10 00:59 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-10-09 02:36 UTCEG score recompute
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-10-08 00:47 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-06 16:39 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-10-05 18:08 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-10-03 21:22 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-10-02 22:59 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-10-02 00:36 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
Show 59 more
  1. 2026-10-01 02:11 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-09-30 03:48 UTCEG score recompute
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-09-29 03:28 UTCEG score recompute
  6. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  7. 2026-09-28 05:04 UTCEG score recompute
  8. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-09-27 06:42 UTCEG score recompute
  10. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-09-26 08:02 UTCEG score recompute
  12. 2026-09-24 19:07 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-23 20:44 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  16. 2026-09-22 22:21 UTCEG score recompute
  17. 2026-09-21 23:58 UTCEG score recompute
  18. 2026-09-21 01:35 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  20. 2026-09-20 02:43 UTCEG score recompute
  21. 2026-09-19 04:19 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  23. 2026-09-18 05:56 UTCEG score recompute
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  25. 2026-09-17 07:34 UTCEG score recompute
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  27. 2026-09-16 09:11 UTCEG score recompute
  28. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  29. 2026-09-15 09:51 UTCEG score recompute
  30. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  31. 2026-09-14 11:28 UTCEG score recompute
  32. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  33. 2026-09-11 16:20 UTCEG score recompute
  34. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  35. 2026-09-10 17:57 UTCEG score recompute
  36. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  37. 2026-09-09 19:34 UTCEG score recompute
  38. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  39. 2026-09-08 02:41 UTCEG score recompute
  40. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  41. 2026-09-07 04:18 UTCEG score recompute
  42. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  43. 2026-09-06 05:54 UTCEG score recompute
  44. 2026-09-05 07:32 UTCEG score recompute
  45. 2026-09-04 09:09 UTCEG score recompute
  46. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  47. 2026-09-03 10:46 UTCEG score recompute
  48. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  49. 2026-09-01 13:56 UTCEG score recompute
  50. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  51. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-08-31 15:30 UTCEG score recompute
  53. 2026-08-31 14:26 UTCEG score recompute
  54. 2026-08-30 20:10 UTCEG score recompute
  55. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  56. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  57. 2026-08-28 23:24 UTCEG score recompute
  58. 2026-08-28 23:01 UTCEG score recomputeFirst assessed: 5.9 MEDIUM
  59. 2026-08-28 22:58 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Same product

1 shown

Maven:org.mariadb:r2dbc-mariadb

Frequently asked(5)

What is CVE-2026-55860?
CVE-2026-55860 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. MariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb does not gate clear-text password authentication plugins on transport encryption because the AuthenticationPlugin interface has no capability for a plugin to require a…
When was the CVE record for CVE-2026-55860 published?
The CVE record for CVE-2026-55860 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 8, 2026; the record at its source may have been updated since.
Is CVE-2026-55860 actively exploited?
CVE-2026-55860 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55860?
CVE-2026-55860 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-2026-55860?
A fix for CVE-2026-55860 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55860 are linked in the Vendor Advisories panel on this page.

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