{"answers":{"affected":"3 open source packages ship an affected version, including github.com/nezhahq/nezha.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53523 exists.","fix":"Upgrade github.com/nezhahq/nezha to 2.2.0 or later.","what":"CVE-2026-53523 is a medium-severity vulnerability in nezhahq nezha, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-53523 and fix it if it is affected.\n\nWhat it is: CVE-2026-53523 is a medium-severity vulnerability in nezhahq nezha, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-53523 exists.\n\nAffected packages and fixed versions:\n- github.com/nezhahq/nezha (Go): affected from 1.0.0; no fix listed\n- github.com/nezhahq/nezha (Go): affected from 1.0.0; fixed in 2.2.0\n- github.com/nezhahq/nezha (Go): affected from 1.0.0; fixed in 2.2.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-53523/ (Markdown: https://insights.sbomify.com/CVE-2026-53523/index.md)","id":"CVE-2026-53523","markdown":"https://insights.sbomify.com/CVE-2026-53523/index.md","name":"CVE-2026-53523","record":{"aliases":["GHSA-9rc6-8cjv-rcvx","GO-2026-5829"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Nezha Monitoring","requires_auth":"none","summary":"Attackers can inject malicious Host headers to redirect users to external sites during OAuth2 authentication, potentially leading to credential theft.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O\u0026M tool. From version 1.0.0 to before version 2.2.0, the getRedirectURL function in oauth2.go:22-29 constructs the OAuth2 callback URL by concatenating the request's Host header with a fixed path, with zero validation of the Host header. This can result in host header injection. This issue has been patched in version 2.2.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Nezha Monitoring: OAuth2 Redirect URL — Host Header Injection","id":"CVE-2026-53523","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"open_redirect","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"WeeChat has a Decompression Bomb in Relay WebSocket (DoS)","id":"CVE-2026-53524"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["1.0.0"],"last_affected":[],"package":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","source":"GO-2026-5829"},{"ecosystem":"Go","fixed":["2.2.0"],"introduced":["1.0.0"],"last_affected":[],"package":"github.com/nezhahq/nezha","purl":null,"source":"GHSA-9rc6-8cjv-rcvx"},{"ecosystem":"Go","fixed":["2.2.0"],"introduced":["1.0.0"],"last_affected":[],"package":"github.com/nezhahq/nezha","purl":"pkg:golang/github.com/nezhahq/nezha","source":"GHSA-9rc6-8cjv-rcvx"}],"prev":{"headline":"Nezha Monitoring: Unbounded WebSocket Streams — Resource Exhaustion DoS","id":"CVE-2026-53522"},"products":["nezha"],"published":"2026-06-12","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-06-15","vendors":["nezhahq"]},"summary":"Attackers can inject malicious Host headers to redirect users to external sites during OAuth2 authentication, potentially leading to credential theft.","url":"https://insights.sbomify.com/CVE-2026-53523/"}