CVE-2020-4049

lowpriority · track · 11OT risk · elevatedEPSS 0.025 · 85 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.53% (85th) EPSS
CVSS 3.5 · low
Is it mine?
99 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-26

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).

01

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 2.2–7.5

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9
v3.12.4lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 0.9 · impact 1.4
v3.17.5highAV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.12.4lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:Nsecondary · ENISA EU
v3.12.4lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:Nsecondary · security-advisories@github.comexploitability 0.9 · impact 1.4
v3.12.2lowCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
02

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-288USCWE-80USCWE-80US
03

affected products (99)

Products and version ranges known to be affected.

showing 20 of 99
04

advisories (2)

Vendor and ecosystem advisories describing this.

  • BIT-wordpress-2020-4049Authenticated self-XSS via theme uploads in WordPress2024-03-06vendor · osvUS

    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).

  • BIT-wordpress-multisite-2020-4049Authenticated self-XSS via theme uploads in WordPress2024-03-06vendor · osvUS

    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).

05

also known as (7)

Other names and identifiers for this entity.

06

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bduosvNVDCVE.orgMITRE
published 2020-06-12modified 2026-06-17
08

references (28)

External citations — patches, advisories, analysis.

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