TI-2026-39438 Aliases CVE-2026-54605 GHSA-prq8-7wvh-44qh

OAuth: Cross-origin token-request redirects can expose signed request metadata

HIGH 71CWE-200Published 2026-07-28 · Updated 2026-07-28

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure, Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200 and CWE-346.

Summary

OAuth is a Ruby wrapper for the OAuth 1.0 and 1.0a protocols, providing clients and servers. From 0.5.5 to 1.1.5, OAuth::Consumer#token_request parses the raw Location header of a 300 to 399 redirect returned by the OAuth server and follows the redirect recursively, which can mutate the consumer's configuration and expose signed OAuth request metadata, including the Authorization header, to a cross-origin host. This issue is fixed in version 1.1.6.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00188 8th percentileScored 2026-11-07

Fix Fixed oauth (ruby-oauth): 1.1.6oauth (RubyGems): 1.1.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ruby-oauth	oauth	0.5.5 to before 1.1.6	1.1.6	Patch available	CNA
—	oauth (RubyGems)	0.5.5 to before 1.1.6	1.1.6	Patch available	GHSA-prq8-7wvh-44qh

oauth Vendorruby-oauth Affected 0.5.5 to before 1.1.6 Fixed in 1.1.6 Patch available CNA
oauth (RubyGems) Vendor— Affected 0.5.5 to before 1.1.6 Fixed in 1.1.6 Patch available GHSA-prq8-7wvh-44qh

Remediation

Fix · CNA oauth (ruby-oauth) Fixed in 1.1.6
Fix · GHSA-prq8-7wvh-44qh oauth (RubyGems) Fixed in 1.1.6 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-54605
2026-10-03 Alias added: GHSA-prq8-7wvh-44qh

References

Other 4

TI-2026-39436 Information disclosure in ruby-oauth oauth2 CVSS 3.1HIGH 8.6

Sources

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