Security readout for executives and security teams
Plain-English summary
HCL Traveler versions 12.0.1.0 and earlier have an XSS flaw in an administration page parameter. An authenticated attacker could cause browser-side script execution in that site context, potentially exposing cookies, session tokens, or other sensitive browser-held data.
Executive priority
Treat this as a moderate-priority remediation for environments using HCL Traveler. It is not presented as broadly exploited, but it affects administrative web functionality and could expose session or sensitive browser data if abused.
Technical view
CVE-2021-27778 is CWE-79 improper neutralization of input during web page generation. The affected input is the Name parameter for Approved Applications in HCL Traveler administration web pages. CVSS 3.1 is 4.9 with network access, high complexity, low privileges, no user interaction, changed scope, low confidentiality impact, and low availability impact.
Likely exposure
Exposure appears limited to organizations running HCL Traveler 12.0.1.0 or earlier, especially where the Traveler administration web pages are reachable by authenticated users. The bundle does not identify affected CPEs or downstream packaged products.
Exploitation context
The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. Exploitation is described as authenticated, network-based, high-complexity XSS against a specific administration parameter, with potential access to browser-retained site data.
Researcher notes
Key gaps are exploit status beyond non-KEV, exact fixed version, and any vendor workaround details not included in the bundle. Validation should stay controlled and focus on version, reachability, authentication boundaries, and confirmation against HCL guidance.
Mitigation direction
- Confirm whether any HCL Traveler deployment is version 12.0.1.0 or earlier.
- Review HCL advisory KB0098044 for the vendor-designated fixed release or workaround.
- Prioritize limiting access to Traveler administration pages to authorized administrative networks and users.
- Review session cookie protections and administrative session timeout settings where configurable.
- Monitor HCL support channels for updated remediation guidance.
Validation and detection
- Inventory HCL Traveler versions across production, staging, and disaster recovery environments.
- Confirm whether Traveler administration web pages are reachable from untrusted networks.
- Review access logs for unusual authenticated activity involving Approved Applications administration pages.
- Use safe, controlled application security testing to confirm remediation after applying vendor guidance.
- Document compensating controls if immediate vendor remediation is not available.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2021-27778 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L
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:H/PR:L/UI:N/S:C/C:L/I:N/A:L1.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098044CVE 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.