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Fencer Vulns
medium 5.3

CVE-2023-5561 json

WordPress < 6.3.2 - Unauthenticated Post Author Email Disclosure

published 2023-10-16 3 y ago modified 2026-09-08 2 mo ago also BIT-wordpress-2023-5561 , BIT-wordpress-multisite-2023-5561 , EUVD-2023-57861

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.3%
EPSS 4.3% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known, plus a Nuclei check

Summary

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 affected website via an Oracle style attack

Patch / fix

  • bitnami wordpress 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
  • bitnami wordpress-multisite 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
  • WordPress WordPress 4.7.27, 4.8.23, 4.9.24, 5.0.20, 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
  • wordpress Debian 12 6.1.6+dfsg1-0+deb12u1
  • wordpress Debian 14, Debian 13 6.3.2+dfsg1-1

debian advisories DEBIAN-CVE-2023-5561

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

4.33% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template WordPress Core - Post Author Email Disclosure nuclei detection template
  • wpscan.com https://wpscan.com/vulnerability/19380917-4c27-4095-abf1-eba6f913b441 referenced PoC, tagged "exploit" by a source, unverified
  • wpscan.com https://wpscan.com/blog/email-leak-oracle-vulnerability-addressed-in-wordpress-6-3-2/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami wordpress
>=4.7.0, <4.7.27
>=4.8.0, <4.8.23
>=4.9.0, <4.9.24
>=5.0.0, <5.0.20
>=5.1.0, <5.1.17
>=5.2.0, <5.2.19
>=5.3.0, <5.3.16
>=5.4.0, <5.4.14
>=5.5.0, <5.5.13
>=5.6.0, <5.6.12
>=5.7.0, <5.7.10
>=5.8.0, <5.8.8
>=5.9.0, <5.9.8
>=6.0.0, <6.0.6
>=6.1.0, <6.1.4
>=6.2.0, <6.2.3
>=6.3.0, <6.3.2
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
bitnami wordpress-multisite
>=4.7.0, <4.7.27
>=4.8.0, <4.8.23
>=4.9.0, <4.9.24
>=5.0.0, <5.0.20
>=5.1.0, <5.1.17
>=5.2.0, <5.2.19
>=5.3.0, <5.3.16
>=5.4.0, <5.4.14
>=5.5.0, <5.5.13
>=5.6.0, <5.6.12
>=5.7.0, <5.7.10
>=5.8.0, <5.8.8
>=5.9.0, <5.9.8
>=6.0.0, <6.0.6
>=6.1.0, <6.1.4
>=6.2.0, <6.2.3
>=6.3.0, <6.3.2
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

Affected products

  • WordPress WordPress

Classification

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.