CVE-2026-54605Network attack vector

Signed metadata disclosure via cross-origin redirects

Published Jul 28, 2026 · Updated Jul 28, 2026

Origin validation error in Ruby OAuth oauth 0.5.5 through 1.1.5 allows remote attackers to expose signed request metadata via redirects. OAuth::Consumer#token_request trusts a 300–399 response's raw Location header, changes the configured site for a different host, and recursively signs and sends the next request. Reachability requires an OAuth token endpoint that returns an attacker-influenced cross-origin redirect; the destination receives request-bound OAuth metadata and gains an SSRF request from the application server.

CVSS severity7.2
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Ruby OAuth oauth 0.5.5 through 1.1.5 allows remote attackers to expose signed request metadata via redirects. OAuth::Consumer#token_request trusts a 300–399 response's raw Location header, changes the configured site for a different host, and recursively signs and sends the next request. Reachability requires an OAuth token endpoint that returns an attacker-influenced cross-origin redirect; the destination receives request-bound OAuth metadata and gains an SSRF request from the application server.

The record

CVE
CVE-2026-54605
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
Ruby OAuth
Product
oauth
Classifications
CWE-200, CWE-918, CWE-346
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=>= 0.5.5, < 1.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ruby OAuth · oauthversion=>= 0.5.5, < 1.1.6

Published CVSS scores

7.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-918Server-Side Request Forgery (SSRF)
CWE-346Origin Validation Error

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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