EUVD-2026-71934
GHSA-47p6-99pv-q7v3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires an admin victim to view the contacts page (UI:R); all other metrics from the provided vector are accurate.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via IP Address Header in all versions up to, and including, 1.10.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. An unauthenticated attacker can first call the 'updateNonce' action - which is accessible without authentication due to its absence from the plugin's permission list - to obtain a valid nonce, then submit a contact form with a malicious payload in a spoofed IP header such as X-Forwarded-For.
AnalysisAI
Stored cross-site scripting in the Contact Form by Supsystic WordPress plugin (all versions ≤1.10.2) allows unauthenticated attackers to inject persistent malicious scripts via a spoofed IP address header. The exploit chain is notable for its two-stage unauthenticated entry: the plugin's updateNonce action is excluded from the permission-check list, granting any unauthenticated caller a valid WordPress nonce; that nonce is then used to submit a contact form with a crafted X-Forwarded-For value, which the plugin stores unsanitized and later renders in the admin contacts list. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Three concrete conditions must hold: (1) The target site must have the Contact Form by Supsystic plugin installed and active in version 1.10.2 or earlier; (2) At least one contact form must exist and be reachable for submission - no special form configuration is required beyond basic installation; (3) A victim with access to the admin contacts list (typically a WordPress Administrator or Editor with plugin access) must navigate to the contacts view after injection. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N yields 7.2 (High), but the UI:N designation is debatable: stored XSS requires a victim (typically a site administrator) to navigate to the contacts list page for the payload to execute, which is more accurately coded as UI:R, dropping the score to approximately 6.1 (Medium). … 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 | Update the Contact Form by Supsystic plugin to the version corresponding to WordPress.org changeset 3679442, which contains the fix commit (https://plugins.trac.wordpress.org/changeset?reponame=&old=3679442%40contact-form-by-supsystic&new=3679442%40contact-form-by-supsystic). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, immediately disable the Contact Form by Supsystic plugin and review all stored contact submissions in the admin panel for suspicious entries, particularly those with unusual IP addresses or content. …
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External POC / Exploit Code
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