EUVD-2026-60793
GHSA-pr7v-7wv9-4xjq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Network-reachable, no privileges needed, scope changes to victim browser; availability impact dropped to N as XSS does not directly impair service.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Lifecycle Timeline
3DescriptionCVE.org
Unauthenticated Cross Site Scripting (XSS) in Contact Form by Supsystic < 1.10.0 versions.
AnalysisAI
Unauthenticated cross-site scripting in Contact Form by Supsystic WordPress plugin (all versions before 1.10.0) allows a remote, unauthenticated attacker to inject and execute arbitrary JavaScript in the browsers of site visitors. The CVSS vector confirms a scope change (S:C), meaning the injected script executes in the victim's browser context rather than the server, enabling session hijacking, credential theft, or malicious redirects. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication is required to submit input to the contact form (confirmed by PR:N in the CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.1 score is driven by a favorable-to-attacker combination of network accessibility, low complexity, and no required privileges (AV:N/AC:L/PR:N), moderated by the need for victim interaction (UI:R) and relatively low individual impact metrics (C:L/I:L/A:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker visits a WordPress site running Contact Form by Supsystic before version 1.10.0 and submits a contact form containing a crafted XSS payload in one of the input fields. The plugin stores or reflects the unsanitized input, and when a site visitor or administrator subsequently loads the affected page, the malicious script executes in their browser, potentially exfiltrating session cookies or WordPress nonces to an attacker-controlled server. … |
| Remediation | Update Contact Form by Supsystic to version 1.10.0 or later immediately; this is the vendor-released patch as documented in the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/contact-form-by-supsystic/vulnerability/wordpress-contact-form-by-supsystic-plugin-1-10-0-cross-site-scripting-xss-vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Immediately audit all WordPress installations for Contact Form by Supsystic plugin versions and document findings; notify all administrators and development teams of CVE-2026-73378 (HIGH severity, unauthenticated XSS). …
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External POC / Exploit Code
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