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Fencer Vulns
high 8.7

CVE-2020-15275 json

malicious SVG attachment causing stored XSS vulnerability in MoinMoin

published 2020-11-11 5 y ago modified 2026-07-08 4 mo ago also GHSA-4q96-6xhq-ff43 , PYSEC-2020-241 , EUVD-2020-0113

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi moin 1.9.11
  • moinmo moinmoin 1.9.11
  • moin Ubuntu 16.04 LTS 1.9.8-1ubuntu1.16.04.3
  • moin Ubuntu 18.04 LTS 1.9.9-1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2020-15275

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • moinmoin-wiki Package Hub 15 SP2 1.9.11-bp152.4.3.1
  • moinmoin-wiki openSUSE Leap 15.2 1.9.11-lp152.3.3.1

opensuse advisories openSUSE-SU-2020:1998-1openSUSE-SU-2020:1966-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15275 updated cvss 8.7

moin: malicious SVG attachment causing stored XSS vulnerability

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.75% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • advisory.checkmarx.net https://advisory.checkmarx.net/advisory/CX-2020-4285 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub 3.1 8.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi moin
<1.9.11
1.9.11

Affected products

  • moinwiki moin-1.9

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.