CVE-2026-12939

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Source

https://cve.org/CVERecord?id=CVE-2026-12939

Import Source

https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-12939.json

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2026-12939

Published

2026-07-29T01:29:41Z

Modified

2026-10-06T02:35:41Z

Severity

6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator

Summary

Newsletters <= 4.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'link' Shortcode Attribute

Details

The Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'link' attribute of the post_thumbnail (and newsletters_post_thumbnail) shortcodes in versions up to and including 4.15. This is due to insufficient input sanitization and output escaping in the post_thumbnail() method in helpers/shortcode.php, which concatenates the user-controlled $link shortcode attribute directly into an href attribute without esc_url() or esc_attr(). 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.

Database specific

{
    "cna_assigner":  "Wordfence",
    "cwe_ids":  [
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12939.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "last_affected":  "4.15"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

WordPress:Plugin / newsletters-lite

Package

Name: newsletters-lite

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Last Affected

4.15

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-12939.json"