{"cve":"CVE-2026-42602","nvd":{"published":"2026-05-13T21:16:47.210","modified":"2026-10-26T14:10:00.130","status":"Analyzed","description":"azureauthextension is the Azure Authenticator Extension. From 0.124.0 to 0.150.0, a server-side authentication bypass in azureauthextension allows any party who holds a single valid Azure access token for any scope the collector's configured identity can mint for to authenticate to any OpenTelemetry receiver that uses auth: azure_auth. The extension's Authenticate method does not validate incoming bearer tokens as JWTs. Instead, it calls its own configured credential to obtain an access token and compares the client's token to the result with string equality — and the scope for that server-side token request is taken from the client-supplied Host header. As a result, a token minted for any Azure resource the service principal has ever been issued a token for (ARM, Graph, Key Vault, Storage, etc.) will authenticate to the collector if the attacker picks a matching Host. Tokens are replayable for the full issued lifetime (commonly several hours for managed identity tokens).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":8.1},"cwes":["CWE-208","CWE-287","CWE-290","CWE-294","CWE-347"],"references":["https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-pjv4-3c63-699f","https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-pjv4-3c63-699f"],"products":["opentelemetry:opentelemetry_collector_contrib"],"source":"nvd","synced_at":"2026-10-26T14:27:29.784594657+00:00"},"epss":{"cve":"CVE-2026-42602","score":0.00222,"percentile":0.12614,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-pjv4-3c63-699f","url":"https://osv.dev/vulnerability/GHSA-pjv4-3c63-699f","summary":"opentelemetry-collector-contrib's azureauthextension Authenticate method does not validate bearer tokens, allowing auth bypass via replay","modified":"2026-09-10T03:51:06.713071704Z","packages":[{"ecosystem":"Go","name":"github.com/open-telemetry/opentelemetry-collector-contrib/extension/azureauthextension","purl":"pkg:golang/github.com/open-telemetry/opentelemetry-collector-contrib/extension/azureauthextension","ranges":[">=0.124.0 <=0.150.0"],"fixed":[]}]},{"id":"GO-2026-5544","url":"https://osv.dev/vulnerability/GO-2026-5544","summary":"Authenticate method auth bypass in github.com/open-telemetry/opentelemetry-collector-contrib/extension/azureauthextension","modified":"2026-10-01T20:45:09.682863867Z","packages":[{"ecosystem":"Go","name":"github.com/open-telemetry/opentelemetry-collector-contrib/extension/azureauthextension","purl":"pkg:golang/github.com/open-telemetry/opentelemetry-collector-contrib/extension/azureauthextension","ranges":[">=0.124.0 <0.151.0"],"fixed":["0.151.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}