Security readout for executives and security teams
Plain-English summary
CVE-2021-40303 is a medium-severity cross-site scripting issue reported in Perfex CRM 1.10 through the /clients/profile area. Successful abuse could let an attacker run script in another user's browser, affecting confidentiality and integrity. The source bundle does not name a fixed version or vendor remediation.
Executive priority
Treat as a moderate web-application risk. Prioritize systems exposed to customers or external users, because browser-based script execution can affect accounts and trust even without server compromise.
Technical view
The record describes CWE-79 XSS in /clients/profile with CVSS 3.1 score 5.4. The vector indicates network attackability, low complexity, low privileges required, user interaction required, changed scope, low confidentiality impact, low integrity impact, and no availability impact.
Likely exposure
Exposure is most relevant to organizations running Perfex CRM 1.10, especially where client profile functionality is reachable by authenticated users. The structured affected-product data is incomplete and lists n/a, so confirm product and version locally.
Exploitation context
The CVE references an Exploit-DB entry, but the bundle does not provide evidence of active exploitation. CISA KEV status is false. Based on CVSS, exploitation requires a low-privileged attacker and user interaction.
Researcher notes
The source data is sparse: it names Perfex CRM 1.10, /clients/profile, CWE-79, CVSS, and one Exploit-DB reference. It does not identify a fixed version, patch commit, affected CPE, or confirmed exploitation campaign.
Mitigation direction
- Check Perfex CRM vendor guidance for a fixed release or official workaround.
- Upgrade affected Perfex CRM 1.10 instances if a vendor-fixed version is available.
- Restrict access to client profile functionality where business operations allow.
- Review customizations around /clients/profile for unsafe output handling.
- Use browser-side and WAF controls as temporary compensating measures.
Validation and detection
- Inventory internet-facing and internal Perfex CRM deployments.
- Confirm whether any instance is running version 1.10.
- Identify whether /clients/profile is available to authenticated users.
- Review logs for suspicious profile-update or profile-view activity.
- Validate remediation against vendor guidance, not only generic XSS checks.
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-2021-40303 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
- 5.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/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:L/UI:R/S:C/C:L/I:L/A:N2.32.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.exploit-db.com/exploits/50097CVE reference
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.