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CVE-2023-5561: WordPress does not properly restrict which user fields are searchable via the REST API, allowing unauthenticated attackers to discern the email addresses of users who have published public posts on an

medium Affects WordPress core. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

WordPress does not properly restrict which user fields are searchable via the REST API, allowing unauthenticated attackers to discern the email addresses of users who have published public posts on an

Package
WordPress core WordPress
Affected versions
>=4.7 and <4.7.27 or >=4.8 and <4.8.23 or >=4.9 and <4.9.24 or >=5.0 and <5.0.20 or >=5.1 and <5.1.17 or >=5.2 and <5.2.19 or >=5.3 and <5.3.16 or >=5.4 and <5.4.14 or >=5.5 and <5.5.13 or >=5.6 and <5.6.12 or >=5.7 and <5.7.10 or >=5.8 and <5.8.8 or >=5.9 and <5.9.8 or >=6.0 and <6.0.6 or >=6.1 and <6.1.4 or >=6.2 and <6.2.3 or >=6.3 and <6.3.2
Fixed in
4.7.27, 4.8.23, 4.9.24, 5.0.20, 5.1.17, 5.2.19, 5.3.16, 5.4.14, 5.5.13, 5.6.12, 5.7.10, 5.8.8, 5.9.8, 6.0.6, 6.1.4, 6.2.3, 6.3.2
Severity
medium  CVSS 5.3
Exploitation
not on CISA KEV · EPSS 4% (91.2th percentile)
Published
2023-10-16
Source
nvd

References

NVD recordWordPress core advisories

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