CVE-2026-18651 (GCVE-0-2026-18651)

Vulnerability from cvelistv5 – Published: 2026-08-03 14:55 – Updated: 2026-08-03 16:58
VLAI
Title
389-ds-base: 389-ds-base: sasl plain bind installs connection credentials before account-lock check, allowing continued access as a locked account
Summary
A flaw was found in 389 Directory Server. During SASL PLAIN authentication, the server installs connection-level bind credentials before performing the account-lock check. If the account is subsequently found to be locked, the bind is reported as failed to the client, but the already-installed authenticated state on the connection is not reverted. A client that supplies valid credentials for an account that has been administratively locked can continue to use the same connection with that account's privileges, defeating account lock as an access-revocation control.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 16:58 UTC
CWE
  • CWE-287 - Improper Authentication
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1085 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-18651 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2510617 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-08-03 00:00
Credits
Red Hat would like to thank Andrew Rukin (Arenadata) and Chris Jarrett-Davies (OpenAI Security Research) for reporting this issue.
Show details on NVD website
To clipboard 

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                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-18651"
            },
            {
              "name": "RHBZ#2510617",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510617"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-30T10:05:06.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-08-03T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "389-ds-base: 389-ds-base: sasl plain bind installs connection credentials before account-lock check, allowing continued access as a locked account",
          "workarounds": [
            {
              "lang": "en",
              "value": "When locking an account, also rotate its LDAP password. Locking the account alone is not enough: this flaw lets a bind with the account\u0027s still-valid password succeed even after it\u0027s locked."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-287: Improper Authentication"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-18651",
        "datePublished": "2026-08-03T14:55:33.426Z",
        "dateReserved": "2026-08-03T11:47:54.931Z",
        "dateUpdated": "2026-08-03T16:58:47.716Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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