Not rated
CVE-2021-23999 If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and…
Description
If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox ESR 78.10 | earliest → < 78.10 | 78.10 |
| Thunderbird 78.10 | earliest → < 78.10 | 78.10 |
| Firefox 88 | earliest → < 88 | 88 |
Other CVEs of Firefox ESR
The 833 CVEs of Firefox ESR →
CVE-2026-5734
Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1
8.1
High
CVE-2026-5732
Incorrect boundary conditions, integer overflow in the Graphics: Text component
8.8
High
CVE-2026-5731
Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and…
9.8
Critical
CVE-2026-2447
Heap buffer overflow in libvpx
8.8
High