Ref# ADV2025_350 | Date: Oct 4th 2025

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Mozilla published security advisories to address vulnerabilities in the following products between September 28^th and September 30^th, 2025. It is recommended that you take these necessary precautions by ensuring your products are always updated.

• Firefox – versions prior to 143.0.3
• Firefox for iOS – versions prior to 143.1

For more information on this update, you can follow this URL:

• Security Vulnerabilities fixed in Firefox 143.0.3
• Security Vulnerabilities fixed in Firefox for iOS 143.1
• Mozilla Security Advisories

The Guyana National CIRT recommends that users and administrators review these updates and apply them where necessary.

PDF Download: Mozilla Security Advisory

References

• Security Vulnerabilities fixed in Firefox 143.0.3. (n.d.). Mozilla. https://www.mozilla.org/en-US/security/advisories/mfsa2025-80/
• Security Vulnerabilities fixed in Firefox for iOS 143.1. (n.d.). Mozilla. https://www.mozilla.org/en-US/security/advisories/mfsa2025-79/
• Mozilla Foundation Security Advisories. (n.d.). Mozilla. https://www.mozilla.org/en-US/security/advisories/
• Mozilla security advisory (2025, October 2). Retrieved from Canadian Centre for Cyber Security. https://www.cyber.gc.ca/en/alerts-advisories/mozilla-security-advisory-av25-635