CVE-2026-81829Network attack vector

Unauthenticated same-origin SSRF via unsanitized JWT key identifier

Published Sep 17, 2026 · Updated Sep 21, 2026

SSRF in SmallRye JWT's AwsAlbKeyResolver allows remote attackers to read same-origin data through crafted JWT key identifiers. When AWS_ALB is configured, AwsAlbKeyResolver appends the untrusted kid header directly to its key-fetch URL without rejecting traversal or query separators. The request occurs before signature verification, so no authentication is required, but reads remain limited to paths on the configured key endpoint origin.

CVSS severity5.3
Medium
EPSS probability0.59%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in SmallRye JWT's AwsAlbKeyResolver allows remote attackers to read same-origin data through crafted JWT key identifiers. When AWS_ALB is configured, AwsAlbKeyResolver appends the untrusted kid header directly to its key-fetch URL without rejecting traversal or query separators. The request occurs before signature verification, so no authentication is required, but reads remain limited to paths on the configured key endpoint origin.

The record

CVE
CVE-2026-81829
Published
Sep 17, 2026
Updated
Sep 21, 2026
Vendor
Commonhaus Foundation
Product
Red Hat JBoss Enterprise Application Platform 8.0
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 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 versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Commonhaus Foundation · Red Hat JBoss Enterprise Application Platform 8.0Affected versions are unavailable in this record.
Commonhaus Foundation · Red Hat build of Apicurio Registry 3Affected versions are unavailable in this record.
Commonhaus Foundation · Red Hat JBoss Enterprise Application Platform Expansion PackAffected versions are unavailable in this record.

Published CVSS scores

5.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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