CVE-2026-35561Network attack vector

Authentication-session hijacking via missing browser-flow protections

Published Apr 3, 2026 · Updated Apr 3, 2026

Authentication bypass in Amazon Athena ODBC driver before 2.1.0.0 allows remote attackers to intercept or hijack authentication sessions. The browser-based flows omit PKCE for OAuth, RelayState CSRF protection for SAML, secure credential caching, and exclusive callback-port binding. Successful exploitation requires an active browser-based authentication exchange and grants the attacker that session's authenticated access.

CVSS severity9.1
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Amazon Athena ODBC driver before 2.1.0.0 allows remote attackers to intercept or hijack authentication sessions. The browser-based flows omit PKCE for OAuth, RelayState CSRF protection for SAML, secure credential caching, and exclusive callback-port binding. Successful exploitation requires an active browser-based authentication exchange and grants the attacker that session's authenticated access.

The record

CVE
CVE-2026-35561
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1AMZNCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.4AMZNCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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