CVE-2026-41479

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 94% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.

CVSS v3
5.4
EG Score
5.4(medium)
EPSS
5.6%
KEV
Not listed

Published

June 8, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 23, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type · Advisory · authlib/authlib · GitHub

https://github.com/authlib/authlib/security/advisories/GHSA-w8p2-r796-3vmq
github_commit Patch Available

commit 3be08468201a (authlib/authlib)

Patch available: authlib/authlib v1.6.10 (contains commit 3be08468201a)

https://github.com/authlib/authlib/commit/3be08468201a7766a93012ce149ea12822cab096

Vendor Advisories for CVE-2026-41479(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
authlib1.7.01.7.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 19:49 UTCEG score recompute
  6. 2026-07-05 02:30 UTCEPSS rescore
  7. 2026-07-04 21:59 UTCEG score recompute
  8. 2026-07-04 06:31 UTCEPSS rescore
  9. 2026-07-04 00:06 UTCEG score recompute
  10. 2026-07-03 02:15 UTCEG score recompute
  11. 2026-07-02 04:25 UTCEG score recompute
  12. 2026-07-01 15:06 UTCEPSS rescore
  13. 2026-07-01 06:33 UTCEG score recompute
  14. 2026-06-30 23:22 UTCEPSS rescore
  15. 2026-06-30 08:18 UTCEG score recompute
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 10:28 UTCEG score recompute
  18. 2026-06-28 14:07 UTCEPSS rescore
  19. 2026-06-28 12:38 UTCEG score recompute
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 14:46 UTCEG score recompute
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 16:56 UTCEG score recompute
  24. 2026-06-25 19:06 UTCEG score recompute
  25. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
  2. 2026-06-24 21:16 UTCEG score recompute
  3. 2026-06-24 14:05 UTCEPSS rescore
  4. 2026-06-23 22:54 UTCEG score recompute
  5. 2026-06-23 21:33 UTCEPSS rescore
  6. 2026-06-22 22:44 UTCEG score recompute
  7. 2026-06-21 20:14 UTCEG score recompute
  8. 2026-06-20 17:20 UTCEG score recompute
  9. 2026-06-19 18:42 UTCEG score recompute
  10. 2026-06-18 19:31 UTCEG score recompute
  11. 2026-06-17 21:08 UTCEG score recompute
  12. 2026-06-16 23:19 UTCEG score recompute
  13. 2026-06-16 01:27 UTCEG score recompute
  14. 2026-06-15 03:38 UTCEG score recompute
  15. 2026-06-14 23:18 UTCEPSS rescore
  16. 2026-06-14 05:49 UTCEG score recompute
  17. 2026-06-13 23:00 UTCEPSS rescore
  18. 2026-06-13 07:50 UTCEG score recompute
  19. 2026-06-12 23:12 UTCEPSS rescore
  20. 2026-06-12 10:00 UTCEG score recompute
  21. 2026-06-11 12:11 UTCEG score recompute
  22. 2026-06-10 14:21 UTCEG score recompute
  23. 2026-06-09 16:32 UTCEG score recompute
  24. 2026-06-08 18:42 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-41479?
CVE-2026-41479 is a medium vulnerability published on June 8, 2026. Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported responsetype and supplies an attacker-controlled redirecturi. The…
When was CVE-2026-41479 disclosed?
CVE-2026-41479 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41479 actively exploited?
CVE-2026-41479 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41479?
CVE-2026-41479 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-41479?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41479, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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