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TI-2026-11012 Aliases CVE-2026-12939GHSA-x3c9-qfw8-8r9c

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

Priority LOW 28CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00349 28th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
contridNewslettersup to 4.15—No fix listedCNA
  • Newsletters Vendorcontrid Affected up to 4.15 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:tribulant:newsletters:*:*:*:*:*:*:*:*——contrid
  • cpe:2.3:a:tribulant:newsletters:*:*:*:*:*:*:*:* Versions — — ·contrid

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-12939
  2. 2026-10-03 Alias added: GHSA-x3c9-qfw8-8r9c

References

Other 6

  • TI-2023-04414 Newsletter Lite < 4.9.3 - Admin+ Command Injection CVSS 3.1HIGH 7.2
  • TI-2014-04458 Unrestricted file upload vulnerability in the Tribulant Slideshow Gallery plugin before… CVSS 2.0MEDIUM 6.5
  • TI-2018-14949 The newsletters-lite plugin before 4.6.8.6 for WordPress has PHP object injection. CVSS 3.0CRITICAL 9.8
  • TI-2018-12822 SQL Injection exists in the Tribulant Slideshow Gallery plugin 1.6.8 for WordPress via… CVSS 3.0CRITICAL 9.8
  • TI-2019-10994 wp-admin/admin-ajax.php?action=newsletters_exportmultiple in the Tribulant Newsletters… CVSS 3.1HIGH 8.8
  • TI-2026-02607 Newsletters <= 4.13 - Unauthenticated SQL Injection via wpmlsubscriber_id Parameter CVSS 3.1HIGH 7.5
See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences