Ad Inserter WordPress plugin: Cross-site scripting via content injection
Summary
The Ad Inserter WordPress plugin up to and including version 2.8.19 contains a flaw that allows content injection (cross-site scripting). An unauthenticated remote attacker can add unwanted content such as ads, scam text or malware links to affected pages. The vendor-independent CNA rates the issue as medium (CVSS 5.3) with limited impact, and the flaw can be triggered without user interaction.
Affected
- Ad Inserter (WordPress plugin) from n/a through 2.8.19
- Vendor: Igor Funa
Fixed in
- Version 2.8.20 (according to the CNA record and Patchstack)
Workaround
- Unknown. No vendor-recommended interim mitigation found. Updating is the recommended fix.
Exploitation
- Not known to be exploited (as of 11 Nov 2026).
- No public proof of concept found; the search was limited and the CVE is very recent.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
Our recommendation
- Check the installed Ad Inserter version on all WordPress sites, including Pro and other variants.
- Update to version 2.8.20 or later and confirm the version afterwards.
- Check the page content of public sites for unexpected ads, links or scripts.
- Monitor for a vendor advisory or proof of concept and re-check exploitation status in a few days.
- Other 2026 Ad Inserter flaws affect the same version range, so updating is more important than fixing this CVE alone.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Patchstack advisory patchstack.com
- CVE Record CVE-2026-124262 www.cve.org
- VulDB entry 435787 vuldb.com
- OffSeq Radar CVE-2026-124262 radar.offseq.com
- Vulners PT-2026-133688 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 17:43.
Original description (NVD)
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Igor Funa Ad Inserter ad-inserter allows Code Injection.This issue affects Ad Inserter: from n/a through 2.8.19.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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