Security readout for executives and security teams
Plain-English summary
TIBCO Nimbus Web Reporting allowed stored cross-site scripting. A low-privileged attacker could plant script content and convince a legitimate network user to view it, causing code to run in that user’s browser context. The CVE rates this as high impact, but the provided sources do not show active exploitation.
Executive priority
Treat this as a high-priority remediation for organizations using TIBCO Nimbus. The issue can affect sensitive data and trusted user sessions, but urgency should be driven by confirmed product use, network exposure, and the absence of active-exploitation evidence in the supplied sources.
Technical view
CVE-2021-35499 affects TIBCO Nimbus versions 10.4.0 and below in the Web Reporting component. The issue is stored XSS with network attack vector, low attack complexity, low privileges required, and required user interaction. CVSS 3.1 score is 8.0 with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where TIBCO Nimbus Web Reporting 10.4.0 or earlier is reachable by users and low-privileged accounts can create or influence stored content viewed by others.
Exploitation context
The source bundle marks KEV as false and provides no cited evidence of active exploitation. Exploitation requires a low-privileged attacker and human interaction from another legitimate user with network access to the affected system.
Researcher notes
The provided evidence identifies the product, component, affected range, CVSS vector, and interaction requirements. It does not include CWE mapping, CPEs, explicit patched versions, exploit reports, or detailed vendor workaround text. Avoid assuming fixes beyond the referenced TIBCO advisory.
Mitigation direction
- Identify all TIBCO Nimbus Web Reporting deployments and owners.
- Confirm whether any instance is version 10.4.0 or below.
- Review the TIBCO advisory for supported fixes or mitigations.
- Prioritize vendor-supported remediation for exposed or business-critical instances.
- Restrict network access to Nimbus Web Reporting where operationally possible.
- Limit low-privileged content creation until remediation is complete.
Validation and detection
- Inventory Nimbus versions from asset records and application administration views.
- Confirm Web Reporting is enabled and reachable only by intended users.
- Review stored reporting content for unexpected script-like entries.
- Check whether low-privileged users can create content viewed by others.
- Look for helpdesk or user reports of suspicious Nimbus browser behavior.
- Document remediation status against the TIBCO advisory.
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.
CVE-2021-35499 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.tibco.com/services/support/advisoriesCVE reference · x_refsource_CONFIRM
- https://www.tibco.com/support/advisories/2021/10/tibco-security-advisory-october-26-2021-tibco-nimbus-2021-35499CVE reference · x_refsource_CONFIRM
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.