{"answers":{"affected":"3 open source packages ship an affected version, including github.com/axllent/mailpit. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-23845 in the wild and no public exploit code.","fix":"Upgrade github.com/axllent/mailpit to 1.28.3 or later.","what":"CVE-2026-23845 is a medium-severity server-side request forgery vulnerability in axllent mailpit, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23845 and fix it if it is affected.\n\nWhat it is: CVE-2026-23845 is a medium-severity server-side request forgery vulnerability in axllent mailpit, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23845 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.28.3\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.28.3\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.28.3\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-2026-23845/ (Markdown: https://insights.sbomify.com/CVE-2026-23845/index.md)","id":"CVE-2026-23845","markdown":"https://insights.sbomify.com/CVE-2026-23845/index.md","name":"CVE-2026-23845","record":{"aliases":["GHSA-6jxm-fv7w-rw5j","GO-2026-4345"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Email testing tool","requires_auth":"none","summary":"An attacker can exploit the HTML Check API to force the server to download external CSS files, enabling Server-Side Request Forgery attacks.","user_interaction":"not_required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mailpit","vendor":"axllent"}],"cvss":{"score":5.8,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"}],"description":"Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `\u003clink rel=\"stylesheet\" href=\"...\"\u003e` tags to inline them for testing. Version 1.28.3 fixes the issue.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API","id":"CVE-2026-23845","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Tugtainer vulnerable to Password Exposure via URL Query Parameter","id":"CVE-2026-23846"},"packages":[{"ecosystem":"Go","fixed":["1.28.3"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":null,"source":"GHSA-6jxm-fv7w-rw5j"},{"ecosystem":"Go","fixed":["1.28.3"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GHSA-6jxm-fv7w-rw5j"},{"ecosystem":"Go","fixed":["1.28.3"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GO-2026-4345"}],"prev":{"headline":"Whisper Money has IDOR Vulnerability on sync/balances endpoint","id":"CVE-2026-23844"},"products":["mailpit"],"published":"2026-01-19","related":[{"cvss_score":7.5,"headline":"Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes","id":"CVE-2026-45713","kev_date_added":null,"published":"2026-07-20"},{"cvss_score":6.5,"headline":"Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) allowing unauthenticated access to emails","id":"CVE-2026-22689","kev_date_added":null,"published":"2026-01-10"},{"cvss_score":5.9,"headline":"Mailpit: Path traversal \u0026 arbitrary file write in mailpit dump --http via attacker-controlled message IDs","id":"CVE-2026-45711","kev_date_added":null,"published":"2026-07-20"},{"cvss_score":5.9,"headline":"Mailpit: Concurrent map read \u0026 write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)","id":"CVE-2026-45712","kev_date_added":null,"published":"2026-07-20"},{"cvss_score":5.8,"headline":"Mailpit has an incomplete fix for GHSA-6jxm: HTML check still permits SSRF to private/loopback/IMDS via missing IP-filter dialer","id":"CVE-2026-45709","kev_date_added":null,"published":"2026-07-20"},{"cvss_score":5.8,"headline":"Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API","id":"CVE-2026-27808","kev_date_added":null,"published":"2026-02-25"}],"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":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-20","vendors":["axllent"]},"summary":"An attacker can exploit the HTML Check API to force the server to download external CSS files, enabling Server-Side Request Forgery attacks.","url":"https://insights.sbomify.com/CVE-2026-23845/"}