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Fencer Vulns
high 8.7

CVE-2020-11026 json

Specially crafted filenames in WordPress leading to XSS

published 2020-04-30 6 y ago modified 2026-09-10 59 d ago also BIT-wordpress-2020-11026 , BIT-wordpress-multisite-2020-11026 , EUVD-2020-3411 , GHSA-3gw2-4656-pfr2

cvss
8.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

In affected versions of WordPress, files with a specially crafted name when uploaded to the Media section can lead to script execution upon accessing the file. This requires an authenticated user with privileges to upload files. This has been patched in version 5.4.1, along with all the previously affected versions via a minor release (5.3.3, 5.2.6, 5.1.5, 5.0.9, 4.9.14, 4.8.13, 4.7.17, 4.6.18, 4.5.21, 4.4.22, 4.3.23, 4.2.27, 4.1.30, 4.0.30, 3.9.31, 3.8.33, 3.7.33).

Patch / fix

  • bitnami wordpress 3.7.33, 3.8.33, 3.9.31, 4.0.30, 4.1.30, 4.2.27, 4.3.23, 4.4.22, 4.5.21, 4.6.18, 4.7.17, 4.8.13, 4.9.14, 5.0.9, 5.1.5, 5.2.6, 5.3.3, 5.4.1
  • bitnami wordpress-multisite 3.7.33, 3.8.33, 3.9.31, 4.0.30, 4.1.30, 4.2.27, 4.3.23, 4.4.22, 4.5.21, 4.6.18, 4.7.17, 4.8.13, 4.9.14, 5.0.9, 5.1.5, 5.2.6, 5.3.3, 5.4.1
  • wordpress wordpress 3.7.33, 3.8.33, 3.9.31, 4.0.30, 4.1.30, 4.2.27, 4.3.23, 4.4.22, 4.5.21, 4.6.18, 4.7.17, 4.8.13, 4.9.14, 5.0.9, 5.1.5, 5.2.6, 5.3.3
  • wordpress Debian 14, Debian 13, Debian 12 5.4.1+dfsg1-1

debian advisories DEBIAN-CVE-2020-11026

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-2020-11026 updated cvss 8.7

wordpress: Specially crafted filenames in WordPress leading to XSS

  • 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

2.09% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

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
OSV 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
bitnami wordpress
>=3.7.0, <3.7.33
>=3.8.0, <3.8.33
>=3.9.0, <3.9.31
>=4.0.0, <4.0.30
>=4.1.0, <4.1.30
>=4.2.0, <4.2.27
>=4.3.0, <4.3.23
>=4.4.0, <4.4.22
>=4.5.0, <4.5.21
>=4.6.0, <4.6.18
>=4.7.0, <4.7.17
>=4.8.0, <4.8.13
>=4.9.0, <4.9.14
>=5.0.0, <5.0.9
>=5.1.0, <5.1.5
>=5.2.0, <5.2.6
>=5.3.0, <5.3.3
>=5.4.0, <5.4.1
3.7.33
3.8.33
3.9.31
4.0.30
4.1.30
4.2.27
4.3.23
4.4.22
4.5.21
4.6.18
4.7.17
4.8.13
4.9.14
5.0.9
5.1.5
5.2.6
5.3.3
5.4.1
bitnami wordpress-multisite
>=3.7.0, <3.7.33
>=3.8.0, <3.8.33
>=3.9.0, <3.9.31
>=4.0.0, <4.0.30
>=4.1.0, <4.1.30
>=4.2.0, <4.2.27
>=4.3.0, <4.3.23
>=4.4.0, <4.4.22
>=4.5.0, <4.5.21
>=4.6.0, <4.6.18
>=4.7.0, <4.7.17
>=4.8.0, <4.8.13
>=4.9.0, <4.9.14
>=5.0.0, <5.0.9
>=5.1.0, <5.1.5
>=5.2.0, <5.2.6
>=5.3.0, <5.3.3
>=5.4.0, <5.4.1
3.7.33
3.8.33
3.9.31
4.0.30
4.1.30
4.2.27
4.3.23
4.4.22
4.5.21
4.6.18
4.7.17
4.8.13
4.9.14
5.0.9
5.1.5
5.2.6
5.3.3
5.4.1

Affected products

  • WordPress WordPress

Classification

Weakness
  • CWE-707 Improper Neutralization
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

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.

The maintainers of WordPress/wordpress-develop published their own advisory on GitHub. Reviewed sources take precedence over it.