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CVE-2026-72887 Affecting libnet-oauth-perl package, versions *

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.72% (52nd percentile)

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  • Snyk IDSNYK-ECHOLATEST-LIBNETOAUTHPERL-18866993
  • published17 Aug 2026
  • disclosed16 Aug 2026
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Introduced: 16 Aug 2026

CVE-2026-72887  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest libnet-oauth-perl.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libnet-oauth-perl package and not the libnet-oauth-perl package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token.

Passing a callback to the constructor selects OAuth 1.0a. get_request_token then revokes that choice when the request token response omits oauth_callback_confirmed, with no exception, no warning and no option to require 1.0a. The access token request is built from the OAuth 1.0 message class, which has no verifier parameter, so oauth_verifier is dropped from the request even when get_access_token was passed one.

oauth_verifier is the binding that OAuth 1.0a added between the authorization step and the token exchange. An application that asked for 1.0a and gets 1.0 is open to OAuth 1.0 session fixation, where an attacker obtains a request token, has the victim authorize it, and then completes the exchange themselves, linking the victim's provider account to a session the attacker controls. No attacker action sets up the downgrade: a provider that does not confirm the callback is enough.