Firefox ESR: Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context.
CVE-2020-12391 is fixed in 4 products on 2 platforms, first by firefox 76.0+build2-0ubuntu0.18.04.1, released May 6, 2020. It is not reported as exploited. Patch Radar priority: High.
Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin. This vulnerability affects Firefox < 76.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 78.0esr | Mozilla Firefox ESR (en-US) 78.0esr | Jun 25, 2020 |
| Linux | |||
| firefox · Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | firefox 76.0+build2-0ubuntu0.18.04.1 | May 6, 2020 |
| firefox · Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | firefox 76.0+build2-0ubuntu0.20.04.1 | May 6, 2020 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | firefox-geckodriver 76.0+build2-0ubuntu0.18.04.1 | May 6, 2020 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | firefox-geckodriver 76.0+build2-0ubuntu0.20.04.1 | May 6, 2020 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 76.0+build2-0ubuntu0.18.04.1 | firefox-mozsymbols 76.0+build2-0ubuntu0.18.04.1 | May 6, 2020 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 76.0+build2-0ubuntu0.20.04.1 | firefox-mozsymbols 76.0+build2-0ubuntu0.20.04.1 | May 6, 2020 |
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