{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3531", "assignerOrgId": "2c85b837-eb8b-40ed-9d74-228c62987387", "state": "PUBLISHED", "assignerShortName": "drupal", "dateReserved": "2026-03-04T16:42:00.011Z", "datePublished": "2026-03-26T20:03:48.873Z", "dateUpdated": "2026-03-26T20:03:48.873Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "2c85b837-eb8b-40ed-9d74-228c62987387", "shortName": "drupal", "dateUpdated": "2026-03-26T20:03:48.873Z"}, "title": "OpenID Connect / OAuth client - Moderately critical - Access bypass - SA-CONTRIB-2026-026", "datePublic": "2026-03-04T18:02:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-288", "description": "CWE-288 Authentication Bypass Using an Alternate Path or Channel", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "affected": [{"vendor": "Drupal", "product": "OpenID Connect / OAuth client", "collectionURL": "https://www.drupal.org/project/openid_connect", "repo": "https://git.drupalcode.org/project/openid_connect", "versions": [{"status": "affected", "version": "0.0.0", "lessThan": "1.5.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.<p>This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0.</p>"}]}], "references": [{"url": "https://www.drupal.org/sa-contrib-2026-026"}], "credits": [{"lang": "en", "value": "Kimberley Massey (kimberleycgm)", "type": "finder"}, {"lang": "en", "value": "Kimberley Massey (kimberleycgm)", "type": "remediation developer"}, {"lang": "en", "value": "Philip Frilling (pfrilling)", "type": "remediation developer"}, {"lang": "en", "value": "Damien McKenna (damienmckenna)", "type": "coordinator"}, {"lang": "en", "value": "Greg Knaddison (greggles)", "type": "coordinator"}, {"lang": "en", "value": "Juraj Nemec (poker10)", "type": "coordinator"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0."}], "id": "CVE-2026-3531", "lastModified": "2026-03-26T21:17:09.283", "metrics": {}, "published": "2026-03-26T21:17:09.283", "references": [{"source": "mlhess@drupal.org", "url": "https://www.drupal.org/sa-contrib-2026-026"}], "sourceIdentifier": "mlhess@drupal.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-288"}], "source": "mlhess@drupal.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.0.0,1.5.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "OpenID Connect / OAuth client", "source": "cna", "vendor": "Drupal"}, "product": "openid", "vendor": "drupal"}], "analysis": {"en": {"generated_at": "2026-03-26T22:26:58.935266+00:00", "value": {"mitigation_remediation": ["Upgrade the Drupal OpenID Connect / OAuth client module to version 1.5.0 or later. ", "Verify that authentication flows only use the standard OAuth redirect and disable any alternate or fallback mechanisms. ", "If an update cannot be applied immediately, restrict access to the authentication endpoints to trusted IP ranges or deploy the site behind a firewall that blocks unauthenticated traffic until the patch is available."], "summary": {"action": "Patch Now", "impact": "Authentication Bypass"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Drupal OpenID Connect / OAuth client module versions released before 1.5.0. Any Drupal site that incorporates these earlier module releases is susceptible, while versions 1.5.0 and later are considered safe.", "description_and_impact": "The Drupal OpenID Connect / OAuth client module contains an authentication bypass flaw that allows an attacker to gain unauthorized access by following an alternate authentication path. This weakness is classified as CWE\u2011288, meaning an actor can authenticate without proper credential verification. Once bypassed, the attacker can act with the privileges of a legitimate user, potentially exposing sensitive data or changing site content.", "risk_and_exploitability": "The advisory lists the issue as moderately critical, and the event classification shows no CVSS or EPSS score, which limits precise risk quantification. The vulnerability is not included in CISA\u2019s KEV catalog, implying no confirmed exploitation in the wild. Based on the description, it is inferred that the attack vector would involve network traffic to the module\u2019s authentication endpoint, with an attacker constructing a request that triggers the alternate path. The flaw does not require privileged access to the server to be exploited, but the exact exploitation conditions are not explicitly documented."}}}}, "created": "2026-03-27T08:32:13.639348+00:00", "updated": "2026-03-27T09:23:42.103144+00:00", "vendors": ["drupal", "drupal$PRODUCT$openid"]}