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Security report for vistraenergy.com

Vistra Corp. · Energy · United States

Medium risk. 2 critical or high findings in Security headers and SSL/TLS.

Security score

74/100

Risk levelMedium

0–100, higher is better. How it is calculated

Vistra Corp. is a well-established Texas-based energy company specializing in competitive energy and power generation markets. The company positions itself as a premier player in the Texas energy sector, targeting market participants, investors, and customers within competitive energy markets. The website reflects a professional corporate presence with clear branding and relevant business descriptions. Technically, the site is built on WordPress using modern tools such as WPBakery Page Builder and NitroPack, hosted on AWS infrastructure, ensuring good performance and mobile optimization. Security posture is adequate with HTTPS enabled and domain registration protections in place; however, the absence of security headers and privacy policy pages indicates room for improvement in compliance and security best practices. Overall, the website is trustworthy and professional but would benefit from enhanced privacy and security disclosures.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

2 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

Need hands-on remediation? Email guard@offseq.com

Keep watching vistraenergy.com

This scan found 22 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

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  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
62
Security headers
50
Email security
70
DNS health
80
Network security
100
GDPR outside view
83
Average
74

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Vistra Corp. operates in the energy sector with a focus on power generation and competitive energy markets in Texas. The business model revolves around energy production and market participation, serving a large customer base. The company has a solid market position as a premier energy provider in Texas, supported by a mature domain and professional digital presence. The website's content and metadata suggest a focus on corporate communications and investor relations, with social media engagement on Facebook and Twitter. No direct contact information or detailed business registrations are publicly disclosed on the site, which may limit direct customer engagement. The company leverages modern web technologies and cloud hosting, indicating a commitment to digital maturity.

Security posture

The website employs HTTPS with a valid SSL configuration and uses domain status flags to prevent unauthorized domain changes. However, the lack of DNSSEC and missing security headers such as Content-Security-Policy and X-Frame-Options reduce the overall security posture. No exposed sensitive data or vulnerable libraries were detected in the provided content. The site includes cookie consent mechanisms, indicating some privacy awareness. The absence of published incident response or vulnerability disclosure policies suggests limited transparency in security incident management. Overall, the security posture is moderate but can be strengthened by implementing recommended headers, DNSSEC, and publishing security policies.

Recommendations

  1. Enable DNSSEC on the domain to enhance DNS security and prevent spoofing.
  2. Implement and publish a comprehensive privacy policy and terms of service to improve compliance and user trust.
  3. Add essential security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options to harden the website against common attacks.
  4. Publish incident response and vulnerability disclosure policies to demonstrate security maturity and transparency.
  5. Include clear and verified contact information such as company emails and phone numbers to improve business credibility and user support.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Vistra Corp.
Description
Vistra is a premier Texas-based energy company focused on the competitive energy and power generation markets.
Key services
Energy generation, Competitive energy market participation
Content quality
good
Branding
consistent

Technology

Stack
WordPress, WPBakery Page Builder, NitroPack, jQuery, FontAwesome
Frameworks
Materializer
Platforms
WordPress
Performance
fast
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
75/100
Good practices seen
  • HTTPS enabled
  • Use of clientDeleteProhibited and other domain status flags

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

Tracking pixels
CookieYes
Marketing tools
CookieYes
Transparency
good

Site quality

Design
good
User experience
good
Content relevance
good
Navigation
good
Professionalism
good
Trustworthiness
high

Key observations

  1. Website is professionally designed and maintained using WordPress with modern plugins.
  2. No explicit privacy policy or terms of service pages found, which is a compliance gap.
  3. Cookie consent mechanism is implemented via CookieYes.
  4. No contact emails or phone numbers explicitly found on the homepage or metadata.
  5. Social media presence includes Facebook and Twitter links.
  6. No security.txt or vulnerability disclosure policy found.
  7. Domain is well aged and registered with reputable registrar and hosting.
  8. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built on a WordPress CMS platform with WPBakery Page Builder and NitroPack for performance optimization. Hosting is provided via AWS, as indicated by the DNS servers. The site uses modern JavaScript libraries including jQuery and FontAwesome for UI elements. Performance is optimized with NitroPack and CDN usage. Accessibility features are basic but present, including an accessibility widget. SEO is supported with proper meta tags, Open Graph tags, and JSON-LD structured data. The site is mobile optimized and responsive. No critical technical issues or deprecated technologies were detected. Opportunities exist to improve security headers and privacy disclosures to reduce technical debt and compliance risks.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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