CVE-2020-26956
In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 83, 78.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Timeline
- CVE published
- Record last updated
Affected versions
- Mozilla Firefox
fixed in 83
- Mozilla Firefox ESR
fixed in 78.5
- Mozilla Thunderbird
fixed in 78.5