EUVD-2026-74603
GHSA-588q-hr78-m65w
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Contributor-level auth required (PR:L); stored XSS crosses scope boundary to victim browsers (S:C); no availability impact; fully consistent with Wordfence's provided vector.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
The My Calendar - Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'fallback' Shortcode Attribute in all versions up to, and including, 3.8.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The bypass relies on hex-encoded shortcode attribute payloads (e.g. \x3cscript\x3e), which wp_kses_post cannot strip on save because they appear as literal backslash sequences rather than real HTML tags; WordPress core's shortcode_parse_atts() then calls stripcslashes() at render time, decoding the escapes into real angle brackets before they reach the unescaped sink.
AnalysisAI
Stored Cross-Site Scripting in the My Calendar - Accessible Event Manager WordPress plugin (all versions through 3.8.3) allows authenticated contributors to inject persistent malicious scripts via the fallback/substitute shortcode attributes. The attack exploits a gap between WordPress's save-time and render-time processing: hex-encoded payloads like \x3cscript\x3e pass through wp_kses_post as harmless literal strings at save time, but WordPress core's shortcode_parse_atts() calls stripcslashes() at render time, converting those sequences into live angle brackets before they reach the unescaped output sink. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a WordPress account with at least Contributor-level privileges - the minimum role needed to publish or submit shortcode-containing posts. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.4 score with scope change (S:C) is well-calibrated: stored XSS that executes in arbitrary visitors' browsers enables session cookie theft, credential harvesting, or malicious redirects beyond the original plugin boundary. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Site administrators should update the My Calendar plugin to the version immediately following 3.8.3, which incorporates the fix from GitHub commit 89bbf7314fac84cdb89e520e8b7b6d69eee8dd3c. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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