{"id":"CVE-2023-41327","aliases":["BIT-wiremock-2023-41327","GHSA-hq8w-9w8w-pmx7"],"url":"https://o3.security/vulnerability/CVE-2023-41327","summary":"Controlled SSRF through URL in the WireMock","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","published":"2023-09-06T20:38:45.161Z","modified":"2026-08-12T03:51:38.843327916Z","cvss":{"score":4.6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"},"epss":{"score":0.00469,"percentile":0.38821,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.wiremock:wiremock-webhooks-extension","fixedVersion":"3.0.3"},{"ecosystem":"Maven","name":"org.wiremock:wiremock-webhooks-extension","fixedVersion":"2.35.1"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/wiremock/wiremock/releases/tag/3.0.0-beta-15"},{"type":"WEB","url":"https://wiremock.org/docs/configuration/#preventing-proxying-to-and-recording-from-specific-target-addresses"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/41xxx/CVE-2023-41327.json"},{"type":"ADVISORY","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/3.0.3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.843327916Z"}}