CVE-2023-30777Public exploitNetwork attack vector

Reflected XSS via unsanitized admin body class

Published May 10, 2023 · Updated Apr 28, 2026

Reflected XSS in WP Engine Advanced Custom Fields and Advanced Custom Fields PRO 6.1.5 and earlier allows attackers to execute browser script. The admin_body_class handler appends the post_status-derived view value to a body-class string after insufficient sanitization, and WordPress emits it without attribute escaping. The payload is reachable on a default installation, but execution requires a logged-in privileged user with ACF access to open a crafted admin URL; it can expose sensitive data or escalate site privileges.

CVSS severity7.1
High
EPSS probability38.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in WP Engine Advanced Custom Fields and Advanced Custom Fields PRO 6.1.5 and earlier allows attackers to execute browser script. The admin_body_class handler appends the post_status-derived view value to a body-class string after insufficient sanitization, and WordPress emits it without attribute escaping. The payload is reachable on a default installation, but execution requires a logged-in privileged user with ACF access to open a crafted admin URL; it can expose sensitive data or escalate site privileges.

The record

CVE
CVE-2023-30777
Published
May 10, 2023
Updated
Apr 28, 2026
Vendor
WP Engine
Product
Advanced Custom Fields
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=6.1.5 changes=[{"at":"6.1.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WP Engine · Advanced Custom Fieldsversion=n/a <=6.1.5 changes=[{"at":"6.1.6","status":"unaffected"}]
WP Engine · Advanced Custom Fields PROversion=n/a <=6.1.5 changes=[{"at":"6.1.6","status":"unaffected"}]

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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