{"id":"GHSA-hq8w-9w8w-pmx7","summary":"WireMock Controlled Server Side Request Forgery vulnerability through URL","details":"### Impact\n\nWireMock can be configured to only permit proxying (and therefore recording) to certain addresses. This is achieved via a list of allowed address rules and a list of denied address rules, where the allowed list is evaluated first. [Documentation](https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses). \n\nUntil WireMock Webhooks Extension [3.0.0-beta-15](https://github.com/wiremock/wiremock/releases/tag/3.0.0-beta-15), the filtering of target addresses from the proxy mode DID NOT work for Webhooks, so the users were potentially vulnerable regardless of the `limitProxyTargets` settings. \n\nVia the WireMock webhooks configuration, POST requests from a webhook might be forwarded to an arbitrary service reachable from WireMock’s instance. For example, If someone is running the WireMock docker Container inside a private cluster, they can trigger internal POST requests against unsecured APIs or even against secure ones by passing a token, discovered using another exploit, via authentication headers.\n\n### Affected  components\n\n- WireMock Webhooks Extension 2.x versions until 2.35.1 (security patch)\n- WireMock 3.x version until 3.0.3 (security patch)\n- All versions of WireMock Studio (discontinued). This distribution bundles the WireMock Webhooks Extension and activates it by default\n\n### Patches and Mitigation\n\n- For WireMock 2.x and 3.x - upgrade to the versions with the security patches\n- Setup network restrictions similarly to https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses \n- For WireMock Studio: Stop using discontinued WireMock Studio, migrate to other distributions. The vendor of WireMock Studio recommends migration to [WireMock Cloud](https://www.wiremock.io/product)\n\nNOTE: It was confirmed that [WireMock Cloud](https://www.wiremock.io/product) does not expose sensitive internal APIs and hence not vulnerable to the issue. No action is needed if you use this SaaS distribution.\n\n### Workarounds\n\n- Use external firewall rules to define the list of permitted destinations\n\n### References\n\n- CVE-2023-39967\n- [Preventing proxying to and recording from specific target addresses](https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses)\n\n### Credits\n\n- @W0rty for reporting CVE-2023-39967 in WireMock Studio\n- WireMock Inc. team for discovering similar exploits in Webhooks and the risk in the Proxy mode defaults for WireMock\n\n","aliases":["BIT-wiremock-2023-41327","CVE-2023-41327"],"modified":"2026-04-13T17:24:55.139401837Z","published":"2023-09-06T20:51:42Z","database_specific":{"github_reviewed_at":"2023-09-06T20:51:42Z","nvd_published_at":"2023-09-06T21:15:14Z","cwe_ids":["CWE-918"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/wiremock/wiremock/security/advisories/GHSA-hq8w-9w8w-pmx7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-41327"},{"type":"PACKAGE","url":"https://github.com/wiremock/wiremock"},{"type":"WEB","url":"https://github.com/wiremock/wiremock/releases/tag/2.35.1"},{"type":"WEB","url":"https://github.com/wiremock/wiremock/releases/tag/3.0.0-beta-15"},{"type":"WEB","url":"https://github.com/wiremock/wiremock/releases/tag/3.0.3"},{"type":"WEB","url":"https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses"}],"affected":[{"package":{"name":"org.wiremock:wiremock-webhooks-extension","ecosystem":"Maven","purl":"pkg:maven/org.wiremock/wiremock-webhooks-extension"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"3.0.3"}]}],"versions":["3.0.0","3.0.1","3.0.2"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/09/GHSA-hq8w-9w8w-pmx7/GHSA-hq8w-9w8w-pmx7.json"}},{"package":{"name":"org.wiremock:wiremock-webhooks-extension","ecosystem":"Maven","purl":"pkg:maven/org.wiremock/wiremock-webhooks-extension"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"2.35.1"}]}],"versions":["2.30.0","2.30.1","2.31.0","2.32.0","2.33.0","2.33.1","2.33.2","2.34.0","2.35.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/09/GHSA-hq8w-9w8w-pmx7/GHSA-hq8w-9w8w-pmx7.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"}]}