Ref# ADV2026_107 | Date: Feb 24th 2026

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Mozilla published a security advisory highlighting vulnerabilities in the following products on February 24, 2026. It is recommended that you take the necessary precautions by ensuring your products are always updated.

• Firefox ESR – versions prior to 140.8
• Firefox ESR – versions prior to 115.33
• Firefox – versions prior to 148

For more information on these updates, you can follow these URLs:

• Mozilla Security Advisories
• Mozilla Foundation Security Advisory 2026-15
• Mozilla Foundation Security Advisory 2026-14
• Mozilla Foundation Security Advisory 2026-13

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

PDF Download: Mozilla Security Advisory

References

• Mozilla Security Advisory (February 24th, 2026). Retrieved from Mozilla. https://www.mozilla.org/en-US/security/advisories/mfsa2026-15/
• Mozilla Security Advisory. (February 24th, 2026). Retrieved from Canadian Centre for Cyber Security. https://cyber.gc.ca/en/alerts-advisories/mozilla-security-advisory-av26-160