Vulnerability · Published Dec 9, 2020 · Assigned by mozilla
CVE-2020-26967
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 0.9% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.9%top 41.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When listening for page changes with a Mutation Observer, a malicious web page could confuse Firefox Screenshots into interacting with elements other than those that it injected into the page. This would lead to internal errors and unexpected behavior in the Screenshots code. This vulnerability affects Firefox < 83.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.21 | firefox | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.22 | firefox | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.23 | firefox | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.21 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.22 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.23 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26967 |
| Alpine:v3.24 | librewolf | 83.0-r0 | ALPINE-CVE-2020-26967 |
Affected products (as reported)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1665820 x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-50/ x_refsource_CONFIRM