{"id":"GHSA-w5cv-pw74-4rxc","summary":"opentelemetry-collector-contrib: githubreceiver silently ignores configured required_headers authentication","details":"## githubreceiver Silently Ignores Configured required_headers Authentication\n\n### Summary\n\nThe githubreceiver webhook handler does not enforce the `required_headers` configuration. Headers are validated at startup (config rejects empty keys/values) but never checked on incoming requests. This follows the same pattern as [GHSA-prf6-xjxh-p698](https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-prf6-xjxh-p698) (awsfirehosereceiver auth bypass). Verified against current main.\n\n### Details\n\nIn `receiver/githubreceiver/config.go`, the `RequiredHeaders` field is defined (line 45) and validated at startup (lines 93-101). But `receiver/githubreceiver/trace_receiver.go` in `handleReq()` (lines 131-185) never references `RequiredHeaders`.\n\nThe gitlabreceiver enforces the same config correctly at `receiver/gitlabreceiver/traces_receiver.go:266-270`:\n\n    for key, value := range gtr.cfg.WebHook.RequiredHeaders {\n        if r.Header.Get(key) != string(value) {\n            return \"\", fmt.Errorf(\"%w: %s\", errInvalidHeader, key)\n        }\n    }\n\n### Amplifying factor\n\nThe `Secret` field defaults to empty and has no validation requiring it to be set. With an empty secret, `github.ValidatePayload` skips HMAC validation entirely. An operator who configures `required_headers` as their authentication mechanism (without setting `secret`) has zero authentication on the webhook endpoint.\n\n### Impact\n\nAn attacker can send arbitrary webhook payloads to the githubreceiver endpoint, bypassing the operator configured authentication. This allows injecting fake CI/CD trace data into the observability pipeline.\n\n### Suggested Fix\n\nAdd RequiredHeaders enforcement to `handleReq()`, matching the gitlabreceiver pattern.","aliases":["CVE-2026-55701","GO-2026-5690"],"modified":"2026-06-25T23:11:34.502584406Z","published":"2026-06-18T15:05:14Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-06-18T15:05:14Z","nvd_published_at":null,"cwe_ids":["CWE-863"]},"references":[{"type":"WEB","url":"https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-w5cv-pw74-4rxc"},{"type":"PACKAGE","url":"https://github.com/open-telemetry/opentelemetry-collector-contrib"}],"affected":[{"package":{"name":"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver","ecosystem":"Go","purl":"pkg:golang/github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.151.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 0.150.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-w5cv-pw74-4rxc/GHSA-w5cv-pw74-4rxc.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"}]}