Security readout for executives and security teams
Plain-English summary
CVE-2026-21939 affects Oracle SQLcl in Oracle Database Server versions 23.4.0 through 23.26.0. An attacker who can access the environment where SQLcl runs could, with user interaction, take over SQLcl. This is not described as internet-remote exploitation, but impact is high if SQLcl is exposed to untrusted local users.
Executive priority
Prioritize remediation for shared admin hosts and systems where SQLcl handles privileged database access. The vulnerability needs local access and user interaction, so urgency is lower than a remote wormable issue but still important because successful exploitation can fully compromise SQLcl.
Technical view
Oracle reports a difficult-to-exploit SQLcl vulnerability with CVSS 3.1 score 7.0: AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. The attacker needs logon to the infrastructure where SQLcl executes, no privileges, and interaction from another person. Successful exploitation can compromise SQLcl confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely on database administration workstations, jump hosts, CI/CD runners, or servers running Oracle SQLcl 23.4.0 through 23.26.0 where untrusted users can log on or influence user interaction.
Exploitation context
No active exploitation is stated in the provided sources, and the CVE is not marked KEV. Exploitation is constrained by local access, high complexity, and required human interaction. Risk increases in shared administrative environments or where SQLcl is used with sensitive database access.
Researcher notes
The public record does not provide CWE, root-cause detail, proof-of-concept status, or fixed version specifics. Treat the Oracle advisory as authoritative for patch mapping. The phrase “unauthenticated attacker with logon” suggests no SQLcl credentials are needed, but local infrastructure access is required.
Mitigation direction
- Review Oracle January 2026 Critical Patch Update guidance for this CVE.
- Update affected SQLcl deployments according to Oracle’s advisory.
- Restrict logon access to systems where SQLcl executes.
- Reduce use of SQLcl on shared or untrusted hosts.
- Train administrators to avoid unexpected SQLcl prompts, files, or workflows.
Validation and detection
- Inventory SQLcl installations and record version numbers.
- Confirm whether versions fall within 23.4.0 through 23.26.0.
- Identify hosts where non-administrators can log on near SQLcl usage.
- Verify Oracle CPU remediation status for affected assets.
- Review administrative workflows requiring human interaction with SQLcl.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
Database behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-21939 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- Oracle AdvisoryCVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.