High [CVE-2026-58440] Information disclosure via incomplete webhook revocation
This high-severity Red Hat Linux advisory covers CVE-2026-58440 affecting OpenShift Pipelines.
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Summary
Webhooks created by a collaborator keep firing after their repo access is revoked → ongoing real-time exfiltration of private repo content (incomplete revocation cleanup in `DeleteCollaboration`) A flaw was found in Gitea. Webhooks created by a collaborator continue to function even after their repository access is revoked.
This incomplete revocation allows for the ongoing, real-time exfiltration of private repository content, leading to information disclosure. An attacker who previously held collaborator permissions can leverage these orphaned webhooks to continuously exfiltrate event payloads and sensitive private repository content without authorization.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-459.
Affected Red Hat products: OpenShift Pipelines. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation checklist
- To mitigate this vulnerability, repository administrators should manually audit and delete all webhooks created by a collaborator immediately upon revoking their access.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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