Firefox ESR and 1 other: The DOMParser API did not properly process '<noscript>' elements for escaping.
CVE-2021-23974 is fixed in 4 products on 2 platforms, first by firefox 86.0+build3-0ubuntu0.18.04.1, released February 26, 2021. It is not reported as exploited. Patch Radar priority: Routine.
The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 86.0+build3-0ubuntu0.18.04.1 | firefox 86.0+build3-0ubuntu0.18.04.1 | Feb 26, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 86.0+build3-0ubuntu0.20.04.1 | firefox 86.0+build3-0ubuntu0.20.04.1 | Feb 26, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 86.0+build3-0ubuntu0.18.04.1 | firefox-geckodriver 86.0+build3-0ubuntu0.18.04.1 | Feb 26, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 86.0+build3-0ubuntu0.20.04.1 | firefox-geckodriver 86.0+build3-0ubuntu0.20.04.1 | Feb 26, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 86.0+build3-0ubuntu0.18.04.1 | firefox-mozsymbols 86.0+build3-0ubuntu0.18.04.1 | Feb 26, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 86.0+build3-0ubuntu0.20.04.1 | firefox-mozsymbols 86.0+build3-0ubuntu0.20.04.1 | Feb 26, 2021 |
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