EUVD-2026-89891
GHSA-r2hq-8v48-p7fj
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Unauthenticated network-reachable XSS (AV:N/PR:N) needing victim interaction (UI:R); browser-context script execution crosses scope (S:C) with limited C/I/A impact, matching a typical reflected/stored WordPress plugin XSS.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
3DescriptionCVE.org
Unauthenticated Cross Site Scripting (XSS) in Happyforms <= 1.26.15 versions.
AnalysisAI
Unauthenticated cross-site scripting in the Happyforms WordPress plugin affects every release through version 1.26.15, allowing an attacker to inject script that executes in a victim's browser when they view attacker-influenced content. The vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L (7.1, High) confirms no authentication is required (PR:N) and no non-default configuration beyond an active plugin, but exploitation depends on a victim loading the crafted content (UI:R), so the attacker cannot compromise a site autonomously and impact stays within the browser/session context rather than server-side code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation targets any WordPress site running the Happyforms plugin at version 1.26.15 or earlier, and requires no authentication (PR:N) and no special non-default configuration beyond having the plugin active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The single available scoring signal is the Patchstack-assigned CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L (7.1, High). … 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 | No vendor-released patch version is identified in the available data, so the immediate action is to check the Happyforms plugin page in the WordPress admin or the Patchstack advisory referenced above and update to the first release published after 1.26.15 as soon as it is available; until then the most effective compensating control is to deactivate the Happyforms plugin entirely, which removes the vulnerable rendering path but also disables all site forms and any submissions or notifications that depend on it. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all WordPress installations to identify sites running the Happyforms plugin at versions 1.26.15 or earlier, and where possible disable or uninstall the plugin; if the plugin is business-critical, deploy virtual patching rules via a Web Application Firewall (WAF) to block XSS payloads targeting Happyforms, and ensure all WordPress core, themes, and other plugins are up to date. …
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External POC / Exploit Code
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