Security readout for executives and security teams
Plain-English summary
HCL OneTest Server versions 10.0, 10.1, and 10.2 can trust arbitrary cross-origin browser requests. If credentials are allowed, an attacker may abuse a user’s browser session to access sensitive information or perform privileged actions. The published severity is medium, with limited confidentiality and integrity impact and no stated availability impact.
Executive priority
Treat this as a moderate-priority application security fix. It is not listed as actively exploited, but affected authenticated systems may expose sensitive data or allow unwanted actions through a user’s browser session.
Technical view
This is a CWE-942 CORS misconfiguration in HCL OneTest Server. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N, score 4.6. Exploitation requires network access, low privileges, and user interaction. The source bundle does not name fixed versions or a specific patch.
Likely exposure
Exposure is limited to organizations running HCL OneTest Server 10.0, 10.1, or 10.2, especially browser-accessible deployments where credentialed CORS is enabled.
Exploitation context
The source bundle does not cite active exploitation, and CISA KEV is false. The attack model requires user interaction and low privileges, which reduces urgency but still matters for authenticated environments handling sensitive test assets or operational data.
Researcher notes
Evidence is limited to the CVE record and HCL reference. Do not assume exploit availability or fixed versions from the provided sources. Focus validation on CWE-942 behavior, credentialed CORS, affected versions, and whether HCL’s advisory provides supported remediation.
Mitigation direction
- Review HCL advisory KB0098603 for vendor-supported remediation guidance.
- Inventory and prioritize affected OneTest Server versions 10.0, 10.1, and 10.2.
- Restrict OneTest Server access to trusted networks and authenticated users.
- Disable arbitrary-origin credentialed CORS where vendor-supported.
- Apply vendor-provided updates or configuration changes when confirmed.
Validation and detection
- Identify all HCL OneTest Server deployments and recorded versions.
- Confirm whether versions 10.0, 10.1, or 10.2 are present.
- Review CORS responses for arbitrary origin trust in credentialed browser contexts.
- Check whether Access-Control-Allow-Credentials is enabled on affected responses.
- Validate remediation against HCL KB0098603 and retest CORS behavior.
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.
CWE-942: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-27786 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
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
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:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N2.12.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098603CVE reference · x_refsource_MISC
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.
Permissive Cross-domain Security Policy with Untrusted Domains
Permissive Cross-domain Security Policy with Untrusted Domains represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.