CVE-2020-6816: Bleach vulnerable to mutation XSS via whitelisted math or svg and raw tag

CVE-2020-6816 · Severity: low · CVSS 3.1 · Published 2020-03-24

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.

Technologies: bleach (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2020-6816 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2020-6816 being exploited in the wild.
How severe is CVE-2020-6816?
Low severity, with a CVSS score of 3.1, published 24 March 2020.
Which products and versions are affected?
bleach (PyPI) ECOSYSTEM:introduced=0,fixed=3.1.2.
Is there a fix for CVE-2020-6816?
Yes. bleach (PyPI): upgrade to 3.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2020-6816?
Check whether you run bleach (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • bleach (PyPI): upgrade to 3.1.2 or later
    pip install "bleach>=3.1.2"

Affected products

  • bleach (PyPI) ECOSYSTEM:introduced=0,fixed=3.1.2

Identifiers

  • CVE-2020-6816
  • GHSA-m6xf-fq7q-8743
  • PYSEC-2020-28

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