Security readout for executives and security teams
Plain-English summary
CVE-2021-4035 is a stored XSS issue in A3Sec Wocu Monitoring 0.27. Malicious script can be saved in report comments through an obsolete TinyMCE editor. Business impact is limited by required privileges and user interaction, but it can expose data or alter content viewed by authorized users.
Executive priority
Handle through normal vulnerability management unless Wocu Monitoring 0.27 is internet-exposed or broadly accessible by privileged users. Prioritize inventory, access review, and vendor update confirmation over emergency response.
Technical view
The flaw is CWE-79 stored cross-site scripting in report creation comments. The CVSS 3.1 score is 3.5 with network access, low attack complexity, high privileges required, and user interaction required. Scope is unchanged, with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure appears limited to Wocu Monitoring version 0.27. Systems are mainly at risk where users have accounts with sufficient privileges to view and edit reports, because exploitation requires authenticated report access and interaction by another user.
Exploitation context
The provided sources do not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires a privileged account and a user viewing affected report content, making broad unauthenticated compromise unlikely from the supplied evidence.
Researcher notes
Evidence is concise and does not name a specific fixed release in the supplied bundle. Avoid assuming broader affected versions. The key validation points are product version, report-comment handling, editor version, and whether report workflows expose stored content to other privileged users.
Mitigation direction
- Check A3Sec or INCIBE guidance for the supported fixed version or workaround.
- Restrict report creation and editing privileges to trusted users only.
- Review privileged Wocu Monitoring accounts and remove unnecessary access.
- Treat report comments as untrusted content until vendor remediation is confirmed.
Validation and detection
- Confirm whether any deployed Wocu Monitoring instance is version 0.27.
- Identify users who can create, edit, and view reports.
- Review report comment fields for unexpected scripts or suspicious markup.
- Verify whether the TinyMCE editor version is obsolete against vendor guidance.
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-2021-4035 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
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/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:H/UI:R/S:U/C:L/I:L/A:N0.92.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.incibe.es/en/incibe-cert/notices/aviso/wocu-monitoring-stored-cross-site-scripting-xssCVE 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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.