{"items":[{"id":"NVI-00014036","kind":"vulnerability","title":"webhookd: Unrestricted HTTP Header to Shell Variable Injection","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-v25g-mvwr-f5fp","CVE-2026-59157"],"plain_summary":"GitHub lists this reviewed advisory for github.com/ncarlier/webhookd. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-22ab6d9119693eb7f76bc7940ec95684"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-09T23:47:06.000Z","value":"6.5 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-35e61729f51bb9059e51aa4b270a14c3"},{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"0.596%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.48481. Missing scores are unknown.","source_id":"sr-22ab6d9119693eb7f76bc7940ec95684"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-35e61729f51bb9059e51aa4b270a14c3","url":"https://github.com/advisories/GHSA-v25g-mvwr-f5fp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-v25g-mvwr-f5fp","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T22:54:12.705Z"},{"id":"sr-22ab6d9119693eb7f76bc7940ec95684","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-59157","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:15:58.859Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-35e61729f51bb9059e51aa4b270a14c3"],"technology":"github.com/ncarlier/webhookd","known_exclusions":[],"conditions_summary":"## Description\nBefore 1.22, if the Basic Auth (`htpasswd`) middleware was not configured, all incoming HTTP headers were blindly forwarded to the webhook script execution environment as shell variables. While the Basic Auth middleware correctly strips the authentication header (`X-WebAuthn-User`) from the incoming request before conditionally re-injecting it on successful authentication, disabling Basic Auth left the system vulnerable if deployed behind an unhardened reverse proxy.\n\n## Impact\nIf an upstream reverse proxy is not properly hardened to strip client-provided authentication headers, an attacker could manually supply these headers (e.g., `X-WebAuthn-User`). A webhook script relying on this forwarded header for privilege elevation or identity verification could therefore be exploited to bypass security controls and impersonate other users.\n\n## Mitigation\nThe `WHD_ALLOWED_UPSTREAM_HEADERS` configuration setting has been introduced to enforce a strict allowlist of HTTP headers that can be converted into shell variables. \n\nAdditionally, the default behavior has been changed to adhere to the principle of least privilege. It is no longer `*` (allow all). The default allowed hea","public_affected_ranges":["< 1.22.0"]}],"null_published_at":"2026-11-07T14:01:58.741Z","source_updated_at":"2026-09-09T23:47:06.000Z","source_disclosed_at":"2026-09-09T23:47:03.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T22:54:12.705Z"},{"id":"NVI-00014036","kind":"vulnerability","title":"webhookd: Unrestricted HTTP Header to Shell Variable Injection","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-v25g-mvwr-f5fp","CVE-2026-59157"],"plain_summary":"GitHub lists this reviewed advisory for github.com/ncarlier/webhookd. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-35e61729f51bb9059e51aa4b270a14c3"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-09-09T23:47:06.000Z","value":"6.5 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-35e61729f51bb9059e51aa4b270a14c3"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-35e61729f51bb9059e51aa4b270a14c3","url":"https://github.com/advisories/GHSA-v25g-mvwr-f5fp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-v25g-mvwr-f5fp","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T22:54:12.705Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-35e61729f51bb9059e51aa4b270a14c3"],"technology":"github.com/ncarlier/webhookd","known_exclusions":[],"conditions_summary":"## Description\nBefore 1.22, if the Basic Auth (`htpasswd`) middleware was not configured, all incoming HTTP headers were blindly forwarded to the webhook script execution environment as shell variables. While the Basic Auth middleware correctly strips the authentication header (`X-WebAuthn-User`) from the incoming request before conditionally re-injecting it on successful authentication, disabling Basic Auth left the system vulnerable if deployed behind an unhardened reverse proxy.\n\n## Impact\nIf an upstream reverse proxy is not properly hardened to strip client-provided authentication headers, an attacker could manually supply these headers (e.g., `X-WebAuthn-User`). A webhook script relying on this forwarded header for privilege elevation or identity verification could therefore be exploited to bypass security controls and impersonate other users.\n\n## Mitigation\nThe `WHD_ALLOWED_UPSTREAM_HEADERS` configuration setting has been introduced to enforce a strict allowlist of HTTP headers that can be converted into shell variables. \n\nAdditionally, the default behavior has been changed to adhere to the principle of least privilege. It is no longer `*` (allow all). The default allowed hea","public_affected_ranges":["< 1.22.0"]}],"null_published_at":"2026-11-02T10:00:37.199Z","source_updated_at":"2026-09-09T23:47:06.000Z","source_disclosed_at":"2026-09-09T23:47:03.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T22:54:12.705Z"}],"next_cursor":null,"snapshot_revision":"42594"}