HTTP/2 302
via: 1.1 google, 1.1 varnish, 1.1 varnish
referrer-policy: strict-origin-when-cross-origin
cross-origin-opener-policy: same-origin
x-backend-server: bedrock-5bfdbb6f5f-cq66x.gcp-us-west1
server: granian
x-content-type-options: nosniff
content-type: text/html; charset=utf-8
location: /en-US/security/advisories/mfsa2024-40/
strict-transport-security: max-age=31536000
accept-ranges: bytes
age: 0
date: Wed, 08 Oct 2025 09:02:59 GMT
x-served-by: cache-bom-vanm7210092-BOM, cache-bom-vanm7210081-BOM
x-cache: MISS, MISS
x-cache-hits: 0, 0
x-timer: S1759914180.711493,VS0,VE265
vary: Accept-Language
content-length: 0
HTTP/2 200
referrer-policy: strict-origin-when-cross-origin
cross-origin-opener-policy: same-origin
via: 1.1 google, 1.1 varnish, 1.1 varnish
x-backend-server: bedrock-5bfdbb6f5f-hf2k2.gcp-us-west1
strict-transport-security: max-age=31536000
content-language: en-US
expires: Wed, 08 Oct 2025 09:13:00 GMT
etag: "9c7faceb5855a5ee35a8ed7d0319119d"
x-frame-options: DENY
x-clacks-overhead: GNU Terry Pratchett
cache-control: max-age=600
server: granian
content-security-policy-report-only: font-src 'self' www.mozilla.org; script-src 'self' 'unsafe-eval' 'unsafe-inline' js.stripe.com s.ytimg.com tagmanager.google.com www.google-analytics.com www.googletagmanager.com www.mozilla.org www.youtube.com; object-src 'none'; img-src 'self' blog.mozilla.org data: images.ctfassets.net www.google-analytics.com www.googletagmanager.com www.mozilla.org; base-uri 'none'; upgrade-insecure-requests; connect-src 'self' https://accounts.firefox.com/ https://basket.mozilla.org o1069899.ingest.sentry.io o1069899.sentry.io region1.google-analytics.com www.google-analytics.com www.googletagmanager.com www.mozilla.org/submit/bedrock/; default-src 'self' *.mozilla.org; frame-src 'self' accounts.firefox.com js.stripe.com www.google-analytics.com www.googletagmanager.com www.youtube.com; media-src 'self' assets.mozilla.net videos.cdn.mozilla.net www.mozilla.org; frame-ancestors 'none'; style-src 'self' www.mozilla.org; form-action 'self' https://accounts.firefox.com/ https://basket.mozilla.org
content-type: text/html; charset=utf-8
content-security-policy: font-src 'self' www.mozilla.org; script-src 'self' 'unsafe-eval' 'unsafe-inline' js.stripe.com s.ytimg.com tagmanager.google.com www.google-analytics.com www.googletagmanager.com www.mozilla.org www.youtube.com; object-src 'none'; img-src 'self' blog.mozilla.org data: images.ctfassets.net www.google-analytics.com www.googletagmanager.com www.mozilla.org; base-uri 'none'; upgrade-insecure-requests; connect-src 'self' https://accounts.firefox.com/ https://basket.mozilla.org o1069899.ingest.sentry.io o1069899.sentry.io region1.google-analytics.com www.google-analytics.com www.googletagmanager.com www.mozilla.org/submit/bedrock/; default-src 'self' *.mozilla.org; frame-src 'self' accounts.firefox.com js.stripe.com www.google-analytics.com www.googletagmanager.com www.youtube.com; media-src 'self' assets.mozilla.net videos.cdn.mozilla.net www.mozilla.org; frame-ancestors 'none'; style-src 'self' 'unsafe-inline' www.mozilla.org; form-action 'self' https://accounts.firefox.com/ https://basket.mozilla.org
x-content-type-options: nosniff
content-encoding: gzip
accept-ranges: bytes
age: 0
date: Wed, 08 Oct 2025 09:03:00 GMT
x-served-by: cache-bom-vanm7210099-BOM, cache-bom-vanm7210081-BOM
x-cache: MISS, MISS
x-cache-hits: 0, 0
x-timer: S1759914180.989396,VS0,VE438
vary: Accept-Encoding
content-length: 8334
Security Vulnerabilities fixed in Firefox ESR 128.2 — Mozilla
Help us improve your Mozilla experience
In addition to Cookies necessary for this site to function, we’d like your permission to set some additional Cookies to better understand your browsing needs and improve your experience. Rest assured — we value your privacy.
Accept All Additional Cookies
Reject All Additional Cookies
Cookie settings
Mozilla Foundation Security Advisory 2024-40
Security Vulnerabilities fixed in Firefox ESR 128.2
Announced
September 3, 2024
Impact
high Products
Firefox ESR
Fixed in
Reporter
Seunghyun Lee
Impact
high
Description
A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability.
References
Reporter
Nils Bars
Impact
high
Description
A potentially exploitable type confusion could be triggered when looking up a property name on an object being used as the with environment.
References
Reporter
Gregory Pappas
Impact
moderate
Description
Internal browser event interfaces were exposed to web content when privileged EventHandler listener callbacks ran for those events. Web content that tried to use those interfaces would not be able to use them with elevated privileges, but their presence would indicate certain browser features had been used, such as when a user opened the Dev Tools console.
References
Reporter
D7
Impact
moderate
Description
Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems don't have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will.
References
Reporter
the Mozilla Fuzzing Team
Impact
moderate
Description
The JavaScript garbage collector could mis-color cross-compartment objects if OOM conditions were detected at the right point between two passes. This could have led to memory corruption.
References
Reporter
Shaheen Fazim, Hafiizh
Impact
low
Description
If a site had been granted the permission to open popup windows, it could cause Select elements to appear on top of another site to perform a spoofing attack.
References
Reporter
the Mozilla Fuzzing Team, Yury Delendik
Impact
high
Description
Memory safety bugs present in Firefox 129, Firefox ESR 128.1, and Thunderbird 128.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
References
