CVE-2026-20736

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Un usuario que previamente subi\u00f3 un adjunto a un repositorio podr\u00eda eliminarlo despu\u00e9s de perder el acceso a ese repositorio al realizar la solicitud a trav\u00e9s de un repositorio diferente al que puede acceder."}], "id": "CVE-2026-20736", "lastModified": "2026-07-15T02:18:23.973", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20736", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-23T21:13:08.431490Z", "version": "2.0.3"}}]}, "published": "2026-01-22T22:16:17.207", "references": [{"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "tags": ["Release Notes"], "url": "https://blog.gitea.com/release-of-1.25.4/"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/go-gitea/gitea/pull/36320"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "tags": ["Release Notes"], "url": "https://github.com/go-gitea/gitea/releases/tag/v1.25.4"}, {"source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "tags": ["Broken Link"], "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-jr6h-pwwp-c8g6"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-20736"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432205"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20736.json"}], "sourceIdentifier": "88ee5874-cf24-4952-aea0-31affedb7ff2", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "88ee5874-cf24-4952-aea0-31affedb7ff2", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-284"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "gitea: Gitea Web Attachment Deletion: Cross-Repository Unauthorized Deletion via Missing Repo Ownership Check", "id": "2432205", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432205"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-284", "details": ["Gitea does not properly verify repository context when deleting attachments. A user who previously uploaded an attachment to a repository may be able to delete it after losing access to that repository by making the request through a different repository they can access."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-20736", "package_state": [{"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-opc-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-cli-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-cli-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-controller-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-controller-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-watcher-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-webhook-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-pipelines-as-code-webhook-rhel9", "product_name": "OpenShift Pipelines"}], "public_date": "2026-01-22T22:01:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-20736\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-20736\nhttps://blog.gitea.com/release-of-1.25.4/\nhttps://github.com/go-gitea/gitea/pull/36320\nhttps://github.com/go-gitea/gitea/releases/tag/v1.25.4\nhttps://github.com/go-gitea/gitea/security/advisories/GHSA-jr6h-pwwp-c8g6"], "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T03:33:29.008350+00:00", "value": {"mitigation_remediation": ["Upgrade Gitea to version 1.25.4 or later, which includes the missing ownership check for attachment deletion.", "Verify that the configuration only allows repository owners or administrators to delete attachments; audit any custom permission settings that might override the default behavior.", "Monitor attachment deletion logs for anomalies and enforce stricter access controls on repositories to reduce the window of opportunity for misuse."], "summary": {"action": "Apply Patch", "impact": "Unauthorized deletion of repository attachments"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Gitea, the open\u2011source Git hosting platform. All versions prior to the release of 1.25.4 are impacted, as the issue was fixed in that update. No version matrix is provided in the advisory, but it is understood that any Gitea instance using an older release is at risk.", "description_and_impact": "A missing ownership check in Gitea allows a user who previously contributed to a repository to delete attachments from that repository after they have lost access to it. The deletion can be performed by sending a request in the context of another repository the user still can access, bypassing the intended restriction. Successful exploitation results in loss of data and can be used to remove evidence or tamper with the repository history. The weakness is a classic example of insufficient authorization controls (CWE\u2011284).", "risk_and_exploitability": "The CVSS score of 7.5 classifies the issue as high severity. The EPSS score is below 1\u202f%, indicating a very low probability of exploitation in the wild, and the vulnerability is not listed in the CISA KEV catalog. Attackers who can authenticate to a repository they no longer own, and who also have access to a different repository, may craft a deletion request that targets the former repository\u2019s attachments. No special hardware or complex prerequisites are required; the flaw exploits a logical oversight in the permission checks that enables the cross\u2011repository deletion."}}}}, "created": "2026-01-23T10:27:14.728374+00:00", "updated": "2026-04-18T03:45:21.071173+00:00", "vendors": ["gitea", "gitea$PRODUCT$gitea"]}