Vulnerability · Published Jan 7, 2021 · Assigned by mozilla
CVE-2020-26976
Medium 6.5
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.6%top 23.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.21 | firefox | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.22 | firefox | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.23 | firefox | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.20 | firefox-esr | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.21 | firefox-esr | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.22 | firefox-esr | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.23 | firefox-esr | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.21 | librewolf | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.22 | librewolf | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.23 | librewolf | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.24 | librewolf | 84.0.1-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.20 | thunderbird | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.21 | thunderbird | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.22 | thunderbird | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Alpine:v3.23 | thunderbird | 78.7.0-r0 | ALPINE-CVE-2020-26976 |
| Debian:12 | firefox-esr | 78.7.0esr-1 | DEBIAN-CVE-2020-26976 |
| Debian:13 | firefox-esr | 78.7.0esr-1 | DEBIAN-CVE-2020-26976 |
| Debian:14 | firefox-esr | 78.7.0esr-1 | DEBIAN-CVE-2020-26976 |
| Debian:12 | thunderbird | 1:78.7.0-1 | DEBIAN-CVE-2020-26976 |
| Debian:13 | thunderbird | 1:78.7.0-1 | DEBIAN-CVE-2020-26976 |
| Debian:14 | thunderbird | 1:78.7.0-1 | DEBIAN-CVE-2020-26976 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2020-26976 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2020-54/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1674343 x_refsource_MISC
- DSA-4840 vendor-advisory, x_refsource_DEBIAN
- GLSA-202102-02 vendor-advisory, x_refsource_GENTOO
- DSA-4842 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20210202 [SECURITY] [DLA 2541-1] thunderbird security update mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20210202 [SECURITY] [DLA 2539-1] firefox-esr security update mailing-list, x_refsource_MLIST