Vulnerability Details : CVE-2020-6816
Potential exploit
In Mozilla Bleach before 3.12, a mutation XSS in bleach.clean when RCDATA and either svg or math tags are whitelisted and the keyword argument strip=False.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2020-6816
- cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-6816
0.42%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 59 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-6816
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2020-6816
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-6816
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EDQU2SZLZMSSACCBUBJ6NOSRNNBDYFW5/
[SECURITY] Fedora 33 Update: python-bleach-3.2.1-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach
Mutation Cross-Site Scripting (mXSS) Vulnerabilities Discovered in Mozilla-BleachExploit;Third Party Advisory
-
https://github.com/mozilla/bleach/security/advisories/GHSA-m6xf-fq7q-8743
mutation XSS via whitelisted math or svg and raw tag · Advisory · mozilla/bleach · GitHubThird Party Advisory
-
https://advisory.checkmarx.net/advisory/CX-2020-4277
Checkmarx Advisory | CX-2020-4277 / Mutation XSS in Mozilla-bleach via svg or mathExploit;Third Party Advisory
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