Plack::Middleware::OAuth versions through 0.10 for Perl do not support the OAuth 2.0 state parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-12740
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-04 18:16:28 UTC
Updated2026-07-06 18:16:45 UTC
DescriptionPlack::Middleware::OAuth versions through 0.10 for Perl do not support the OAuth 2.0 state parameter. RequestTokenV2 builds the provider authorization redirect without issuing a state value, and AccessTokenV2 exchanges the callback code and registers the resulting token into the session (register_session) without verifying that the callback corresponds to an authorization request this session initiated. Any application that uses this middleware for OAuth 2.0 login is exposed to login cross-site request forgery: because the callback is not bound to the session that began the flow, an attacker who starts an authorization with their own provider account can deliver the resulting callback to a victim, causing the victim's session to complete the attacker's authorization and associating the attacker's provider identity and access token with that session. Where the application persists this as an account link, the attacker may retain access to the victim's account through their own provider credentials.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS: 0.001720000 probability, percentile 0.067980000 (date 2026-07-08)

Problem Types: CWE-352 | CWE-352 CWE-352 Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CORNELIUS PlackMiddlewareOAuth affected 0.10 custom Not specified

References

ReferenceSourceLinkTags
datatracker.ietf.org/doc/html/rfc6749 9b29abf9-4ab0-4765-b253-1875cd9b441e datatracker.ietf.org
github.com/c9s/Plack-Middleware-OAuth/pull/13 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
security.metacpan.org/patches/P/Plack-Middleware-OAuth/0.10/CVE-2026-12740-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org
rt.cpan.org/Ticket/Display.html 9b29abf9-4ab0-4765-b253-1875cd9b441e rt.cpan.org
www.openwall.com/lists/oss-security/2026/07/04/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Workarounds

CNA: Use the latest version from the git repository, with the patch applied.

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