{"id":"CVE-2020-15275","aliases":["GHSA-4q96-6xhq-ff43","PYSEC-2020-241"],"title":"malicious SVG attachment causing stored XSS vulnerability","summary":"malicious SVG attachment causing stored XSS vulnerability","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","vendor":"moin","product":"moin","ecosystem":"pip","affected":["moin < 1.9.11"],"patched":["moin 1.9.11"],"published":"2020-11-11","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-4q96-6xhq-ff43","references":[{"url":"https://github.com/moinwiki/moin-1.9/security/advisories/GHSA-4q96-6xhq-ff43"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15275"},{"url":"https://github.com/moinwiki/moin-1.9/commit/31de9139d0aabc171e94032168399b4a0b2a88a2"},{"url":"https://advisory.checkmarx.net/advisory/CX-2020-4285"},{"url":"https://github.com/moinwiki/moin-1.9"},{"url":"https://github.com/moinwiki/moin-1.9/releases/tag/1.9.11"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/moin/PYSEC-2020-241.yaml"},{"url":"https://pypi.org/project/moin"}],"tags":["osv","pip"],"epss":0.01746,"epssPercentile":0.76794,"ingestedAt":"2026-07-08T18:25:45.522Z","slug":"CVE-2020-15275","body":"## Overview\n\n### Impact\nAn attacker with `write` permissions can upload an SVG file that contains malicious javascript. This javascript will be executed in a user's browser when the user is viewing that SVG file on the wiki.\n\n### Patches\nUsers are strongly advised to upgrade to a patched version.\n\nMoinMoin Wiki 1.9.11 has the necessary fixes and also contains other important fixes.\n\n### Workarounds\nIt is not advised to work around this, but to upgrade MoinMoin to a patched version.\n\nThat said, a work around via a Content Security Policy in the web server might be possible.\n\nAlso, it is of course helpful if you give `write` permissions (which include uploading attachments) only to trusted users.\n\n### For more information\nIf you have any questions or comments about this advisory, email me at [twaldmann@thinkmo.de](mailto:twaldmann@thinkmo.de).\n\n### Credits\n\nThis vulnerability was discovered by:\n\nCatarina Leite from the Checkmarx SCA AppSec team\n\n## Affected packages\n\n- `moin < 1.9.11`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `moin 1.9.11`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}