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Fencer Vulns
medium 5.7

CVE-2020-4048 json

Open redirect in wp_validate_redirect() in WordPress

published 2020-06-12 6 y ago modified 2026-09-08 2 mo ago also BIT-wordpress-2020-4048 , BIT-wordpress-multisite-2020-4048 , EUVD-2020-25306 , GHSA-q6pw-gvf4-5fj5

cvss
5.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

In affected versions of WordPress, due to an issue in wp_validate_redirect() and URL sanitization, an arbitrary external link can be crafted leading to unintended/open redirect when clicked. 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).

Patch / fix

  • bitnami wordpress 3.7.34, 3.8.34, 3.9.32, 4.0.31, 4.1.31, 4.2.28, 4.3.24, 4.4.23, 4.5.22, 4.6.19, 4.7.18, 4.8.14, 4.9.15, 5.0.10, 5.1.6, 5.2.7, 5.3.4, 5.4.2
  • bitnami wordpress-multisite 3.7.34, 3.8.34, 3.9.32, 4.0.31, 4.1.31, 4.2.28, 4.3.24, 4.4.23, 4.5.22, 4.6.19, 4.7.18, 4.8.14, 4.9.15, 5.0.10, 5.1.6, 5.2.7, 5.3.4, 5.4.2
  • wordpress wordpress 3.7.34, 3.8.34, 3.9.32, 4.0.31, 4.1.31, 4.2.28, 4.3.24, 4.4.23, 4.5.22, 4.6.19, 4.7.18, 4.8.14, 4.9.15, 5.0.10, 5.1.6, 5.2.7, 5.3.4, 5.4.2
  • wordpress Debian 14, Debian 13, Debian 12 5.4.2+dfsg1-1

debian advisories DEBIAN-CVE-2020-4048

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-2020-4048 updated cvss 5.7

wordpress: open redirect in wp_validate_redirect function

  • 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

1.98% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
NVD 2.0 4.9 AV:N/AC:M/Au:S/C:P/I:P/A:N
OSV 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
bitnami wordpress
>=3.7.0, <3.7.34
>=3.8.0, <3.8.34
>=3.9.0, <3.9.32
>=4.0.0, <4.0.31
>=4.1.0, <4.1.31
>=4.2.0, <4.2.28
>=4.3.0, <4.3.24
>=4.4.0, <4.4.23
>=4.5.0, <4.5.22
>=4.6.0, <4.6.19
>=4.7.0, <4.7.18
>=4.8.0, <4.8.14
>=4.9.0, <4.9.15
>=5.0.0, <5.0.10
>=5.1.0, <5.1.6
>=5.2.0, <5.2.7
>=5.3.0, <5.3.4
>=5.4.0, <5.4.2
3.7.34
3.8.34
3.9.32
4.0.31
4.1.31
4.2.28
4.3.24
4.4.23
4.5.22
4.6.19
4.7.18
4.8.14
4.9.15
5.0.10
5.1.6
5.2.7
5.3.4
5.4.2
bitnami wordpress-multisite
>=3.7.0, <3.7.34
>=3.8.0, <3.8.34
>=3.9.0, <3.9.32
>=4.0.0, <4.0.31
>=4.1.0, <4.1.31
>=4.2.0, <4.2.28
>=4.3.0, <4.3.24
>=4.4.0, <4.4.23
>=4.5.0, <4.5.22
>=4.6.0, <4.6.19
>=4.7.0, <4.7.18
>=4.8.0, <4.8.14
>=4.9.0, <4.9.15
>=5.0.0, <5.0.10
>=5.1.0, <5.1.6
>=5.2.0, <5.2.7
>=5.3.0, <5.3.4
>=5.4.0, <5.4.2
3.7.34
3.8.34
3.9.32
4.0.31
4.1.31
4.2.28
4.3.24
4.4.23
4.5.22
4.6.19
4.7.18
4.8.14
4.9.15
5.0.10
5.1.6
5.2.7
5.3.4
5.4.2

Affected products

  • WordPress wordpress-develop

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site
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.