EUVD-2026-43355Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
XSS via low-privilege authenticated user requires victim interaction; availability impact is not a realistic primary outcome for ad plugin XSS.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
1DescriptionCVE.org
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Spacetime Ad Inserter ad-inserter allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Ad Inserter: from n/a through <= 2.8.11.
AnalysisAI
Cross-site scripting in the Ad Inserter WordPress plugin (Spacetime, versions through 2.8.11) allows authenticated low-privilege users to inject malicious JavaScript into pages served to other site visitors. The CVSS scope-change metric (S:C) confirms the vulnerability crosses the security boundary from the plugin into victims' browser contexts, enabling session theft or unauthorized action execution on behalf of targeted users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an authenticated WordPress session with sufficient privilege to access the Ad Inserter plugin configuration - at minimum a low-privilege role such as contributor or editor (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 base score of 6.5 is supported by the vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with a contributor or low-privilege author account on a WordPress site running Ad Inserter ≤ 2.8.11 navigates to the plugin's ad configuration interface and injects a malicious JavaScript payload into an ad code block. When an administrator or another authenticated user subsequently visits a page where that ad block renders, their browser executes the injected script - allowing the attacker to steal session cookies, perform authenticated actions as the victim, or escalate privileges to administrator. … |
| Remediation | Update the Ad Inserter plugin to a version beyond 2.8.11. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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