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CVE-2020-4049

Authenticated self-XSS via theme uploads in WordPress

2.4 LowFix available

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

2.53%Down 0.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 2.4

Authenticated self-XSS via theme uploads in WordPress

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
CVE-2020-4049
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Weakness
CWE-80
Updated
2026-11-02
EUVDEUVD-2020-25307 2.4

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
EUVD-2020-25307
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Updated
2026-11-03
NVD 2.4

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
CVE-2020-4049
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness
CWE-80, CWE-79
Updated
2026-11-02
OSV 2.4

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
CVE-2020-4049
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-4049 2.4

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
DEBIAN-CVE-2020-4049
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2020-4049 2.4

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
UBUNTU-CVE-2020-4049
CVSS 3.1
2.4 LowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVBIT-wordpress-2020-4049 No score

Authenticated self-XSS via theme uploads in WordPress

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
BIT-wordpress-2020-4049
Updated
2026-11-02
OSVBIT-wordpress-multisite-2020-4049 No score

Authenticated self-XSS via theme uploads in WordPress

In affected versions of WordPress, when uploading themes, the name of the theme folder can be crafted in a way that could lead to JavaScript execution in /wp-admin on the themes page. This does require an admin to upload the theme, and is low severity self-XSS. This has been patched in version 5.4.2, along with all the previously affected versions via a minor release (5.3.4, 5.2.7, 5.1.6, 5.0.10, 4.9.15, 4.8.14, 4.7.18, 4.6.19, 4.5.22, 4.4.23, 4.3.24, 4.2.28, 4.1.31, 4.0.31, 3.9.32, 3.8.34, 3.7.34).

Record
BIT-wordpress-multisite-2020-4049
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wordpress
Bitnami
 3.7.0 up to 3.7.34, 3.8.0 up to 3.8.34, 3.9.0 up to 3.9.32, 4.0.0 up to 4.0.31, 4.1.0 up to 4.1.31, 4.2.0 up to 4.2.28, 4.3.0 up to 4.3.24, 4.4.0 up to 4.4.23, 4.5.0 up to 4.5.22, 4.6.0 up to 4.6.19, 4.7.0 up to 4.7.18, 4.8.0 up to 4.8.14, 4.9.0 up to 4.9.15, 5.0.0 up to 5.0.10, 5.1.0 up to 5.1.6, 5.2.0 up to 5.2.7, 5.3.0 up to 5.3.4, 5.4.0 up to 5.4.2
3.7.343.8.343.9.324.0.314.1.314.2.284.3.244.4.234.5.224.6.194.7.184.8.144.9.155.0.105.1.65.2.75.3.45.4.2
wordpress-multisite
Bitnami
 3.7.0 up to 3.7.34, 3.8.0 up to 3.8.34, 3.9.0 up to 3.9.32, 4.0.0 up to 4.0.31, 4.1.0 up to 4.1.31, 4.2.0 up to 4.2.28, 4.3.0 up to 4.3.24, 4.4.0 up to 4.4.23, 4.5.0 up to 4.5.22, 4.6.0 up to 4.6.19, 4.7.0 up to 4.7.18, 4.8.0 up to 4.8.14, 4.9.0 up to 4.9.15, 5.0.0 up to 5.0.10, 5.1.0 up to 5.1.6, 5.2.0 up to 5.2.7, 5.3.0 up to 5.3.4, 5.4.0 up to 5.4.2
3.7.343.8.343.9.324.0.314.1.314.2.284.3.244.4.234.5.224.6.194.7.184.8.144.9.155.0.105.1.65.2.75.3.45.4.2
wordpress
Debian:12
 before 5.4.2+dfsg1-1
5.4.2+dfsg1-1
wordpress
Debian:13
 before 5.4.2+dfsg1-1
5.4.2+dfsg1-1
wordpress
Debian:14
 before 5.4.2+dfsg1-1
5.4.2+dfsg1-1
wordpress
Debian:8
From an advisory covering 4 CVEs
 before 4.1.31+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 21 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+deb8u14.1.30+dfsg-0+deb8u1
4.1.31+dfsg-0+deb8u1
wordpress
Debian:9
From an advisory covering 6 CVEs
 before 4.7.18+dfsg-1+deb9u1, 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+1
Show 4 moreShow less
4.7.5+dfsg-2+deb9u34.7.5+dfsg-2+deb9u44.7.5+dfsg-2+deb9u54.7.5+dfsg-2+deb9u6
4.7.18+dfsg-1+deb9u1
wordpress
Debian:10
From an advisory covering 5 CVEs
 before 5.0.10+dfsg1-0+deb10u1, plus listed versions
5.0.4+dfsg1-15.0.4+dfsg1-1+deb10u15.0.4+dfsg1-1+deb10u2
5.0.10+dfsg1-0+deb10u1
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
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

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, NVD, OSV

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

In short

CVE-2020-4049 is a low vulnerability (CVSS 2.4) in Wordpress, published June 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.53%, the 85th percentile. Fixed in wordpress 3.7.34.

References

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