CVE-2026-66908Public exploitNetwork attack vector

Authentication bypass via missing JWT claim validation

Published Aug 24, 2026 · Updated Aug 24, 2026

Improper authentication in Apache Camel 4.8.0 through 4.21.x allows remote attackers to access protected HTTP endpoints with a mis-scoped JWT. JWTAuthenticationConfigurer.buildJwtOptions returns null when neither jwtIssuer nor jwtAudience is configured, causing both configureAuthentication paths to omit JWTAuthOptions.setJWTOptions and skip iss and aud validation. Exploitation requires an unexpired token signed by a key in the configured keystore; success grants the endpoint access assigned to a token intended for another issuer or audience.

CVSS severity7.5
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Apache Camel 4.8.0 through 4.21.x allows remote attackers to access protected HTTP endpoints with a mis-scoped JWT. JWTAuthenticationConfigurer.buildJwtOptions returns null when neither jwtIssuer nor jwtAudience is configured, causing both configureAuthentication paths to omit JWTAuthOptions.setJWTOptions and skip iss and aud validation. Exploitation requires an unexpired token signed by a key in the configured keystore; success grants the endpoint access assigned to a token intended for another issuer or audience.

The record

CVE
CVE-2026-66908
Published
Aug 24, 2026
Updated
Aug 24, 2026
Vendor
The Apache Software Foundation
Product
Apache Camel
Classifications
CWE-287, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 24, 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?

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

  1. Affected versionversion=4.8.0 <4.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Camelversion=4.8.0 <4.22.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1550.001Use Alternate Authentication Material: Application Access Token

Public exploit references

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Technologies

Your stack

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Your stack

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