Security readout for executives and security teams
Plain-English summary
CVE-2021-42838 is a reflected cross-site scripting issue in Grand Vice info Co. webopac7. A vulnerable book search field can reflect attacker-supplied JavaScript back to a user. The main business risk is user-session abuse, phishing-like content, or data exposure when a user follows a crafted link.
Executive priority
Treat as a moderate web-application risk. It is not known to be actively exploited from the provided sources, but internet-facing library search portals can affect public users and institutional trust. Remediate after higher-severity actively exploited issues, unless exposed systems support sensitive workflows.
Technical view
The source describes improper restriction of special characters in the webopac7 book search field, classified as CWE-79. It is remotely reachable without authentication, but requires user interaction. CVSS 3.1 is 6.1: network attack vector, low complexity, no privileges, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is likely limited to organizations running Grand Vice info Co. webopac7 versions 7.1.20160701 or 1.8.20160701, especially if the book search interface is internet-accessible. The source bundle provides no CPEs, deployment prevalence, or hosted-service details.
Exploitation context
The bundle states unauthenticated remote attackers can inject JavaScript syntax for reflected XSS. It does not cite active exploitation, and KEV status is false. Practical impact depends on user interaction and the sensitivity of sessions or data accessible through the webopac7 interface.
Researcher notes
Key gaps are patch status, CPE coverage, exploit observations, and vendor remediation detail. The available record supports reflected XSS in the book search parameter for two named versions only. Avoid broad product assumptions beyond Grand Vice info Co. webopac7.
Mitigation direction
- Check Grand Vice and TWCERT guidance for fixed builds or official workarounds.
- Prioritize vendor-provided remediation for affected webopac7 versions.
- Inventory public webopac7 search pages and reduce unnecessary exposure.
- Review browser-side protections and application controls as compensating measures only.
Validation and detection
- Confirm whether webopac7 7.1.20160701 or 1.8.20160701 is deployed.
- Identify internet-facing webopac7 book search interfaces.
- Review access logs for unusual requests targeting search parameters.
- Use safe, authorized input-handling tests without executing script payloads.
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-2021-42838 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.twcert.org.tw/tw/cp-132-5286-b92c8-1.htmlCVE 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.
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.