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Security report for opensubtitles.org

OpenSubtitles.org · Technology · N/a

Medium risk. 5 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

71/100

Risk levelMedium

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

OpenSubtitles.org operates a large, multilingual subtitle database platform providing free subtitle downloads and uploads for movies and TV series. The website targets a broad audience of movie and TV content consumers worldwide, offering advanced search features, API support, and community engagement through forums and blogs. The business model includes free access with optional VIP membership for ad removal. Technically, the site uses a mature stack with jQuery and various third-party scripts, including Google reCAPTCHA for login security and Cloudflare Insights for performance monitoring. Security posture is moderate with HTTPS enforced but missing some recommended security headers. The WHOIS data is malformed and incomplete, limiting domain trust verification. Overall, the site is functional, content-rich, and safe for general audiences but could improve privacy compliance and security headers.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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

5 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 Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  3. 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 SSL Key Length

      SSL certificate uses 256-bit key, which is considered weak

      What to do: Use at least 2048-bit RSA or 256-bit ECC key

      • CWE-326
      • OWASP A04:2025
      • Mozilla TLS: Mozilla Server Side TLS 6.0 intermediate: rsa_key_size 2048

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

Keep watching opensubtitles.org

This scan found 20 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

€25per month

  • 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
65
Security headers
50
Email security
75
DNS health
85
Network security
100
GDPR outside view
53
Average
71

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

OpenSubtitles.org holds a strong market position as one of the largest subtitle databases globally, serving millions of users. Its competitive advantage lies in its extensive multilingual subtitle collection, advanced search capabilities, and integration options such as APIs and browser extensions. Revenue streams likely include advertising and VIP memberships. The platform fosters a community ecosystem with active forums and blogs, supporting user engagement and content contribution. Growth indicators include continuous subtitle uploads and active user participation. Partnerships with VPN providers and subtitle-related services enhance its ecosystem. Strategic observations suggest focusing on improving privacy compliance and security to maintain user trust.

Security posture

The website demonstrates a moderate security maturity level with HTTPS enabled and use of Google reCAPTCHA to protect login forms. However, it lacks several important security headers such as Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options, which are critical to mitigate common web vulnerabilities like clickjacking and MIME sniffing. The presence of third-party scripts from some suspicious domains poses potential risk vectors. No exposed sensitive data or obvious vulnerabilities were detected in the HTML content. Compliance with GDPR and other privacy regulations appears basic, with no explicit cookie consent mechanisms. Incident response and security policy information are not publicly available, indicating room for improvement in security culture and transparency.

Recommendations

  1. Implement comprehensive Content-Security-Policy headers to reduce XSS risks.
  2. Add X-Frame-Options and X-Content-Type-Options headers to enhance browser security.
  3. Establish and publish clear privacy and cookie policies with consent mechanisms to improve GDPR compliance.
  4. Regularly audit and update third-party scripts to remove or replace suspicious sources.
  5. Develop and disclose incident response procedures and security policies to build user trust.

Contact details published on the site

Addresses
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
OpenSubtitles.org
Description
Movie and TV Subtitles in multiple languages, thousands of translated subtitles uploaded daily. Free download from source, API support, millions of users.
Key services
Subtitle search and download, Subtitle upload, Subtitle request, API support, Browser extensions, AI subtitle generation
Content quality
good
Branding
consistent

Technology

Stack
jQuery, jQuery UI, lscache, Google reCAPTCHA, Cloudflare Insights, PerfOps rom3, Push SDK
Performance
moderate
Mobile
basic
Accessibility
basic
SEO
good

Security

Observed score
70/100
Good practices seen
  • Use of HTTPS
  • Use of Google reCAPTCHA on login form
  • No exposed sensitive data in HTML

Analytics and tracking

Services
Google Analytics, Cloudflare Insights
Tracking level
moderate
Privacy practices
basic

Advertising

Ad networks
Revive Adserver
Tracking pixels
Cloudflare Insights
Marketing tools
Push SDK
Transparency
basic

Site quality

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

Key observations

  1. Website is fully accessible with rich content and interactive features
  2. No WAF or blocking mechanisms detected
  3. WHOIS data is unavailable or malformed, limiting domain trust verification
  4. Site uses multiple third-party scripts and ad networks including some suspicious domains
  5. Site provides extensive subtitle database with multi-language support
  6. Security headers are partially implemented; improvements recommended
  7. No explicit privacy or cookie consent banners detected
  8. Site uses Google reCAPTCHA for login security
  9. Advertising includes affiliate links for VPN services
  10. Content is safe and suitable for general audiences
Technical notes

Notes

The website uses a traditional web stack centered on jQuery and jQuery UI libraries, supplemented by caching (lscache), Google reCAPTCHA, and performance monitoring tools like Cloudflare Insights and PerfOps rom3. The site is moderately optimized for performance and mobile use but could benefit from modernization to newer frameworks and improved accessibility features. SEO is well addressed with meta tags, structured data (JSON-LD), and multilingual support. Hosting provider details are not explicit. The presence of multiple external scripts and ad networks indicates a complex ecosystem that requires careful management to avoid performance and security issues.
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

Earlier scans of this domain

  1. 63/100Medium31 findingsView report
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