# CVE-2026-49272

OAuthLib device-flow allows token issuance without valid device_code (auth bypass).

- Page: https://www.vulneraibility.com/cve/CVE-2026-49272
- CVSS: 8.5
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.33% (percentile 26.0)
- CISA SSVC: exploitation poc, automatable no, technical impact partial (assessed 2026-11-05)
- Weakness: CWE-287
- Also known as: GHSA-3jp2-3mrg-2vxc
- Published: 2026-11-05

## Affected versions

- oauthlib: affected >= 3.3.0 and < 4.0.1

A version outside these ranges is not a statement that it is unaffected.

## Impact

Attackers can obtain valid bearer tokens by omitting or supplying bogus device_code to the token endpoint, bypassing device authorization and enabling unauthorized access.

## Action

Immediate action required

## Recommendation

Upgrade OAuthLib to v4.0.1 and rotate impacted tokens; audit token endpoints.

## References

- [other] https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3jp2-3mrg-2vxc
- [other] https://github.com/oauthlib/oauthlib/pull/954
- [other] https://github.com/oauthlib/oauthlib/commit/77a5f1c8ce00da2b0b8c5f6e9cc129920085f114
- [other] https://github.com/oauthlib/oauthlib/releases/tag/v4.0.1

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.