| Name | CVE-2020-26976 |
| Description | When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. This vulnerability affects Firefox < 84. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2539-1, DLA-2541-1, DSA-4840-1, DSA-4842-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 125.0.3-1 | fixed |
| firefox-esr (PTS) | buster | 91.12.0esr-1~deb10u1 | fixed |
| buster (security) | 115.10.0esr-1~deb10u1 | fixed | |
| bullseye | 115.7.0esr-1~deb11u1 | fixed | |
| bullseye (security) | 115.10.0esr-1~deb11u1 | fixed | |
| bookworm | 115.7.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 115.10.0esr-1~deb12u1 | fixed | |
| sid, trixie | 115.10.0esr-1 | fixed | |
| thunderbird (PTS) | buster | 1:91.12.0-1~deb10u1 | fixed |
| buster (security) | 1:115.10.1-1~deb10u1 | fixed | |
| bullseye | 1:115.7.0-1~deb11u1 | fixed | |
| bullseye (security) | 1:115.10.1-1~deb11u1 | fixed | |
| bookworm | 1:115.7.0-1~deb12u1 | fixed | |
| bookworm (security) | 1:115.10.1-1~deb12u1 | fixed | |
| sid, trixie | 1:115.10.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 84.0-1 | |||
| firefox-esr | source | stretch | 78.7.0esr-1~deb9u1 | DLA-2539-1 | ||
| firefox-esr | source | buster | 78.7.0esr-1~deb10u1 | DSA-4840-1 | ||
| firefox-esr | source | (unstable) | 78.7.0esr-1 | |||
| thunderbird | source | stretch | 1:78.7.0-1~deb9u1 | DLA-2541-1 | ||
| thunderbird | source | buster | 1:78.7.0-1~deb10u1 | DSA-4842-1 | ||
| thunderbird | source | (unstable) | 1:78.7.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/#CVE-2020-26976
https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/#CVE-2020-26976
https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2020-26976