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CVE-2020-11026

Specially crafted filenames in WordPress leading to XSS

8.7 HighFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

2.09%Up 0.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 8.7

Specially crafted filenames in WordPress leading to XSS

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).

Record
CVE-2020-11026
CVSS 3.1
8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Weakness
CWE-707
Updated
2026-11-02
EUVDEUVD-2020-3411 8.7

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).

Record
EUVD-2020-3411
CVSS 3.1
8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Updated
2026-11-03
NVD 8.7

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).

Record
CVE-2020-11026
CVSS 3.1
8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-707, CWE-79
Updated
2026-11-02
OSV 5.4

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).

Record
CVE-2020-11026
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-11026 5.4

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).

Record
DEBIAN-CVE-2020-11026
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2020-11026 8.7

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).

Record
UBUNTU-CVE-2020-11026
CVSS 3.1
8.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVBIT-wordpress-2020-11026 No score

Specially crafted filenames in WordPress leading to XSS

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).

Record
BIT-wordpress-2020-11026
Updated
2026-11-02
OSVBIT-wordpress-multisite-2020-11026 No score

Specially crafted filenames in WordPress leading to XSS

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).

Record
BIT-wordpress-multisite-2020-11026
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wordpress
Bitnami
3.7.0 up to 3.7.33, 3.8.0 up to 3.8.33, 3.9.0 up to 3.9.31, 4.0.0 up to 4.0.30, 4.1.0 up to 4.1.30, 4.2.0 up to 4.2.27, 4.3.0 up to 4.3.23, 4.4.0 up to 4.4.22, 4.5.0 up to 4.5.21, 4.6.0 up to 4.6.18, 4.7.0 up to 4.7.17, 4.8.0 up to 4.8.13, 4.9.0 up to 4.9.14, 5.0.0 up to 5.0.9, 5.1.0 up to 5.1.5, 5.2.0 up to 5.2.6, 5.3.0 up to 5.3.3, 5.4.0 up to 5.4.1
3.7.333.8.333.9.314.0.304.1.304.2.274.3.234.4.224.5.214.6.184.7.174.8.134.9.145.0.95.1.55.2.65.3.35.4.1
wordpress-multisite
Bitnami
3.7.0 up to 3.7.33, 3.8.0 up to 3.8.33, 3.9.0 up to 3.9.31, 4.0.0 up to 4.0.30, 4.1.0 up to 4.1.30, 4.2.0 up to 4.2.27, 4.3.0 up to 4.3.23, 4.4.0 up to 4.4.22, 4.5.0 up to 4.5.21, 4.6.0 up to 4.6.18, 4.7.0 up to 4.7.17, 4.8.0 up to 4.8.13, 4.9.0 up to 4.9.14, 5.0.0 up to 5.0.9, 5.1.0 up to 5.1.5, 5.2.0 up to 5.2.6, 5.3.0 up to 5.3.3, 5.4.0 up to 5.4.1
3.7.333.8.333.9.314.0.304.1.304.2.274.3.234.4.224.5.214.6.184.7.174.8.134.9.145.0.95.1.55.2.65.3.35.4.1
wordpress
Debian:12
before 5.4.1+dfsg1-1
5.4.1+dfsg1-1
wordpress
Debian:13
before 5.4.1+dfsg1-1
5.4.1+dfsg1-1
wordpress
Debian:14
before 5.4.1+dfsg1-1
5.4.1+dfsg1-1
wordpress
Debian:8
From an advisory covering 4 CVEs
before 4.1.30+dfsg-0+deb8u1, plus listed versions
4.1+dfsg-14.1+dfsg-1+deb8u14.1+dfsg-1+deb8u104.1+dfsg-1+deb8u114.1+dfsg-1+deb8u12
Show 20 moreShow less
4.1+dfsg-1+deb8u134.1+dfsg-1+deb8u144.1+dfsg-1+deb8u154.1+dfsg-1+deb8u164.1+dfsg-1+deb8u174.1+dfsg-1+deb8u184.1+dfsg-1+deb8u24.1+dfsg-1+deb8u34.1+dfsg-1+deb8u44.1+dfsg-1+deb8u54.1+dfsg-1+deb8u64.1+dfsg-1+deb8u74.1+dfsg-1+deb8u84.1+dfsg-1+deb8u94.1.1+dfsg-14.1.25+dfsg-1+deb8u14.1.26+dfsg-1+deb8u14.1.27+dfsg-0+deb8u14.1.28+dfsg-0+deb8u14.1.29+dfsg-0+deb8u1
4.1.30+dfsg-0+deb8u1
wordpress
Debian:9
From an advisory covering 5 CVEs
before 4.7.5+dfsg-2+deb9u6, plus listed versions
4.7.5+dfsg-24.7.5+dfsg-2+deb9u14.7.5+dfsg-2+deb9u1~bpo8+14.7.5+dfsg-2+deb9u24.7.5+dfsg-2+deb9u2~bpo8+14.7.5+dfsg-2+deb9u34.7.5+dfsg-2+deb9u44.7.5+dfsg-2+deb9u5
4.7.5+dfsg-2+deb9u6
wordpress
Debian:10
From an advisory covering 5 CVEs
before 5.0.4+dfsg1-1+deb10u2, plus listed versions
5.0.4+dfsg1-15.0.4+dfsg1-1+deb10u1
5.0.4+dfsg1-1+deb10u2
wordpress
Ubuntu:16.04:LTS
All versions, plus listed versions
4.3+dfsg-14.3.1+dfsg-14.4+dfsg-14.4.1+dfsg-14.4.2+dfsg-14.4.2+dfsg-1ubuntu1
None known
wordpress
Ubuntu:18.04:LTS
All versions, plus listed versions
4.8.2+dfsg-24.8.3+dfsg-14.9.1+dfsg-14.9.2+dfsg-14.9.4+dfsg-14.9.5+dfsg1-1
None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
wordpress
Ubuntu:20.04:LTS
All versions, plus listed versions
5.2.2+dfsg1-15.2.4+dfsg1-15.3.2+dfsg1-15.3.2+dfsg1-1ubuntu1
None known
wordpress
Ubuntu:22.04:LTS
All versions, plus listed versions
5.7.1+dfsg1-2ubuntu15.8.1+dfsg1-2ubuntu15.8.2+dfsg1-1ubuntu15.8.3+dfsg1-1ubuntu15.8.3+dfsg1-1ubuntu1.1
None known
wordpress
Ubuntu:24.04:LTS
All versions, plus listed versions
6.2+dfsg1-1ubuntu16.4.3+dfsg1-1ubuntu1
None known
wordpress
Ubuntu:25.10
All versions, plus listed versions
6.7.2+dfsg1-1.1ubuntu1
None known
wordpress
Ubuntu:26.10
All versions, plus listed versions
6.7.2+dfsg1-1.1ubuntu2
None known
wordpress
Ubuntu:26.04:LTS
All versions, plus listed versions
6.7.2+dfsg1-1.1ubuntu16.7.2+dfsg1-1.1ubuntu2
None known

History

History
RecordedChangedSources
affected, facts
aliases, productsEUVD
first indexedCVE List, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-11026 is a high vulnerability (CVSS 8.7) in Wordpress, published April 30, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.09%, the 81st percentile. Fixed in wordpress 3.7.33.

References

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