What’s Vulnerable › Vulnerabilities

CVE-2020-15275: malicious SVG attachment causing stored XSS vulnerability in MoinMoin

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-11 · updated 2026-06-17
• Weakness: CWE-79

Description

MoinMoin is a wiki engine. In MoinMoin before version 1.9.11, an 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. Users are strongly advised to upgrade to a patched version. MoinMoin Wiki 1.9.11 has the necessary fixes and also contains other important fixes.

Affected products

• Moinmoin: before 1.9.11 — fixed in 1.9.11

How to fix

Upgrade to a fixed version: Moinmoin 1.9.11. Check the vendor advisory for mitigations.

References

• https://advisory.checkmarx.net/advisory/CX-2020-4285
• https://github.com/moinwiki/moin-1.9/commit/31de9139d0aabc171e94032168399b4a0b2a88a2
• https://github.com/moinwiki/moin-1.9/releases/tag/1.9.11
• https://github.com/moinwiki/moin-1.9/security/advisories/GHSA-4q96-6xhq-ff43
• https://advisory.checkmarx.net/advisory/CX-2020-4285
• https://github.com/moinwiki/moin-1.9/commit/31de9139d0aabc171e94032168399b4a0b2a88a2
• https://github.com/moinwiki/moin-1.9/releases/tag/1.9.11
• https://github.com/moinwiki/moin-1.9/security/advisories/GHSA-4q96-6xhq-ff43

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