https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 29 Sep 2026 03:54:53 +0000 https://vulnerability.circl.lu/vuln/cve-2020-6816 <p><strong>Affected:</strong> Mozilla Bleach</p> <p>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.</p> <p><strong>Affected:</strong> Mozilla Bleach</p> <p>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.</p> https://vulnerability.circl.lu/vuln/cve-2020-6816 https://vulnerability.circl.lu/vuln/ghsa-m6xf-fq7q-8743 <p><strong>Affected:</strong> PyPI: bleach</p> <p>### Impact</p> <p>A [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of:</p> <p>* the `svg` or `math` in the allowed/whitelisted tags * an RCDATA tag (see below) in the allowed/whitelisted tags * the keyword argument `strip=False`</p> <p>### Patches</p> <p>Users are encouraged to upgrade to bleach v3.1.2 or greater.</p> <p>### Workarounds</p> <p>* modify `bleach.clean` calls to use `strip=True`, or not whitelist `math` or `svg` tags and one or more of the following tags:</p> <p>``` script noscript style noframes xmp noembed iframe ```</p> <p>* A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk.</p> <p>### References</p> <p>* https://bugzilla.mozilla.org/show_bug.cgi?id=1621692 * https://cure53.de/fp170.pdf * https://nvd.nist.gov/vuln/detail/CVE-2020-6816 * https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach</p> <p>### Credits</p> <p>* Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx</p> <p>### For more information</p> <p>If you have any questions or comments about this advisory:</p> <p>* Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues) * Email us at [security@mozilla.org](mailto:security@mozilla.org)</p> <p><strong>Affected:</strong> PyPI: bleach</p> <p>### Impact</p> <p>A [mutation XSS](https://cure53.de/fp170.pdf) affects users calling `bleach.clean` with all of:</p> <p>* the `svg` or `math` in the allowed/whitelisted tags * an RCDATA tag (see below) in the allowed/whitelisted tags * the keyword argument `strip=False`</p> <p>### Patches</p> <p>Users are encouraged to upgrade to bleach v3.1.2 or greater.</p> <p>### Workarounds</p> <p>* modify `bleach.clean` calls to use `strip=True`, or not whitelist `math` or `svg` tags and one or more of the following tags:</p> <p>``` script noscript style noframes xmp noembed iframe ```</p> <p>* A strong [Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without `unsafe-inline` and `unsafe-eval` [`script-src`s](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src)) will also help mitigate the risk.</p> <p>### References</p> <p>* https://bugzilla.mozilla.org/show_bug.cgi?id=1621692 * https://cure53.de/fp170.pdf * https://nvd.nist.gov/vuln/detail/CVE-2020-6816 * https://www.checkmarx.com/blog/vulnerabilities-discovered-in-mozilla-bleach</p> <p>### Credits</p> <p>* Reported by [Yaniv Nizry](https://twitter.com/ynizry) from the CxSCA AppSec group at Checkmarx</p> <p>### For more information</p> <p>If you have any questions or comments about this advisory:</p> <p>* Open an issue at [https://github.com/mozilla/bleach/issues](https://github.com/mozilla/bleach/issues) * Email us at [security@mozilla.org](mailto:security@mozilla.org)</p> https://vulnerability.circl.lu/vuln/ghsa-m6xf-fq7q-8743 https://vulnerability.circl.lu/vuln/pysec-2020-28 <p><strong>Affected:</strong> PyPI: bleach</p> <p>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.</p> <p><strong>Affected:</strong> PyPI: bleach</p> <p>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.</p> https://vulnerability.circl.lu/vuln/pysec-2020-28