CVE-2020-26976
First published: Tue Dec 15 2020(Updated: )
When a HTTPS page 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.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/firefox | 118.0.2-1 | |
| debian/firefox-esr | 91.12.0esr-1~deb10u1 115.3.1esr-1~deb10u1 102.15.0esr-1~deb11u1 115.3.1esr-1~deb11u1 102.15.1esr-1~deb12u1 115.3.0esr-1~deb12u1 115.3.0esr-1 | |
| debian/thunderbird | 1:91.12.0-1~deb10u1 1:115.3.1-1~deb10u1 1:102.13.1-1~deb11u1 1:115.3.1-1~deb11u1 1:102.15.1-1~deb12u1 1:115.3.1-1~deb12u1 1:115.3.1-1 | |
| Thunderbird | <78.7 | 78.7 |
| Firefox | <84.0 | |
| Debian | =9.0 | |
| Debian | =10.0 | |
| Firefox | <84 | 84 |
| Firefox ESR | <78.7 | 78.7 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1674343
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/
- https://lists.debian.org/debian-lts-announce/2021/02/msg00001.html
- https://lists.debian.org/debian-lts-announce/2021/02/msg00002.html
- https://security.gentoo.org/glsa/202102-02
- https://www.debian.org/security/2021/dsa-4840
- https://www.debian.org/security/2021/dsa-4842
- https://www.mozilla.org/security/advisories/mfsa2020-54/
- 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
- https://security-tracker.debian.org/tracker/CVE-2020-26976
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2020-26976?
CVE-2020-26976 is considered a moderate severity vulnerability.
How do I fix CVE-2020-26976?
To fix CVE-2020-26976, you should update your software to the latest version as specified in the vulnerability details.
Which versions are affected by CVE-2020-26976?
CVE-2020-26976 affects Mozilla Firefox versions prior to 84, as well as Thunderbird and Firefox ESR versions before 78.7.
What kind of vulnerability is CVE-2020-26976?
CVE-2020-26976 is a security vulnerability that relates to the improper handling of HTTPS pages embedded in HTTP contexts.
Is CVE-2020-26976 exploitable?
Yes, CVE-2020-26976 can potentially be exploited by attackers to intercept secure communications when HTTPS content is improperly framed.
- collector/security-tracker-debian
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- canonical/firefox
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- version/debian/9.0
- version/debian/10.0
- canonical/firefox esr