APCu Manager < 4.5.0 - Unauthenticated Stored XSS via Cache Key Pollution (CVE-2026-10083) | HOL Guard CVE

High · CVSS 7.5CVE-2026-10083

APCu Manager < 4.5.0 - Unauthenticated Stored XSS via Cache Key Pollution

Answer in brief

CVE-2026-10083 records a High severity (CVSS 7.5) vulnerability in APCu Manager < 4.5.0 - Unauthenticated Stored XSS via Cache Key Pollution. The current sources do not mark it as known exploited. The current feed maps Unknown/APCu Manager (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 29, 2026Updated Jun 29, 2026Source checked Sep 20, 2026First seen by HOL Jun 29, 2026Material review Jun 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/APCu Manager (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/APCu Managergeneric	>=0 <4.5.0	4.5.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/APCu Manager.
Review the reported fix. Update Unknown/APCu Manager to 4.5.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 29, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The APCu Manager WordPress plugin before 4.5.0 does not escape APCu object-cache keys before rendering them in an admin-area page, leading to a Stored Cross-Site Scripting vulnerability. When a persistent object cache is enabled, cache keys derived from unsanitised user input (e.g. a transient name created by another APCu Manager WordPress plugin before 4.5.0 from an unauthenticated request) are output without escaping and execute arbitrary JavaScript in the session of an administrator viewing the page.

Quoted source text, attributed separately from HOL analysis.