CVE-2025-64762Network attack vector

Session-token disclosure via missing anti-caching headers

Published Nov 21, 2025 · Updated Nov 21, 2025

Sensitive-data caching in WorkOS AuthKit Next.js before 2.11.1 allows remote attackers to obtain another user's session token. Authenticated response paths omit defensive Cache-Control and Vary headers, allowing a configured CDN to reuse one user's token-bearing response for another user. Exposure requires CDN caching on authenticated routes; Vercel deployments are unaffected unless those routes manually enable caching.

CVSS severity9.1
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data caching in WorkOS AuthKit Next.js before 2.11.1 allows remote attackers to obtain another user's session token. Authenticated response paths omit defensive Cache-Control and Vary headers, allowing a configured CDN to reuse one user's token-bearing response for another user. Exposure requires CDN caching on authenticated routes; Vercel deployments are unaffected unless those routes manually enable caching.

The record

CVE
CVE-2025-64762
Published
Nov 21, 2025
Updated
Nov 21, 2025
Vendor
WorkOS
Product
AuthKit Next.js
Classifications
CWE-524, CAPEC-204, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WorkOS · AuthKit Next.jsversion=< 2.11.1

Published CVSS scores

8.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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-524Use of Cache Containing Sensitive Information
CAPEC-204Lifting Sensitive Data Embedded in Cache
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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