malicious SVG attachment causing stored XSS vulnerability in MoinMoin

Vulnerability 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.

References

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