EUVD-2026-86589
GHSA-w7ph-m5xc-pc82
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Unauthenticated network injection (PR:N) but execution requires an admin to open the spam-log modal (UI:R); admin-context script yields scope change and limited C:L/I:L, no availability impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Zero Spam for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Nested POST Array Keys via Contact Form 7 Integration in all versions up to, and including, 5.7.10 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. The payload is delivered by submitting a Contact Form 7 request with a nested POST array key containing arbitrary HTML or JavaScript - PHP parses the field name into a nested array key, which is stored verbatim in the zerospam_log.submission_data column when Zero Spam flags the submission as spam due to the absence of the zerospam_david_walsh_key field.
Articles & Coverage 1
AnalysisAI
Stored cross-site scripting in the Zero Spam for WordPress plugin (all versions up to and including 5.7.10) lets unauthenticated attackers push arbitrary HTML or JavaScript into the plugin's spam log through its Contact Form 7 integration. The payload rides in a nested POST array key - PHP parses the crafted field name into a nested array key that is written verbatim to the zerospam_log.submission_data column whenever the submission is flagged as spam, and it executes when an administrator opens the flagged submission in the admin spam-log details modal, so exploitation depends on privileged user interaction despite unauthenticated injection. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the Zero Spam for WordPress plugin (version <=5.7.10) installed AND its Contact Form 7 integration module active, plus a reachable Contact Form 7 form on the site. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N, base 7.2) describes an unauthenticated, network-reachable stored XSS with a scope change, which superficially reads as a high-priority issue. … 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 Zero Spam for WordPress plugin to a release newer than 5.7.10 as soon as it is published; the plugin repository changeset at https://plugins.trac.wordpress.org/changeset?reponame=&old=3709762%40zero-spam&new=3709762%40zero-spam corresponds to the upstream fix, but because no tagged patched release version is stated in the available data, treat this as an upstream fix whose packaged version is not yet independently confirmed - verify the installed version against the plugin's changelog before relying on it, and consult the Wordfence advisory linked in the CVE references for patch status. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every WordPress installation running Zero Spam for WordPress and confirm which are at version 5.7.10 or earlier; where the Contact Form 7 integration is not essential, deactivate and remove the plugin outright, and for sites that must retain it, restrict wp-admin access to trusted IP ranges, enforce multi-factor authentication for all administrator accounts, and snapshot the zerospam_log table before any cleanup. …
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External POC / Exploit Code
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