{"cve":"CVE-2026-42259","nvd":{"published":"2026-05-07T20:16:44.400","modified":"2026-06-17T10:47:35.800","status":"Deferred","description":"Saltcorn is an extensible, open source, no-code database application builder. Prior to versions 1.4.6, 1.5.6, and 1.6.0-beta.5, Saltcorn validates the post-login dest parameter with a string check that only blocks :/ and //. Because all WHATWG-compliant browsers normalise backslashes (\\) to forward slashes (/) for special schemes, a payload such as /\\evil.com/path slips through is_relative_url(), is emitted unchanged in the HTTP Location header, and causes the browser to navigate cross-origin to an attacker-controlled domain. The bug is reachable on a default install and only requires a victim who can be tricked into logging in via a crafted Saltcorn URL. This issue has been patched in versions 1.4.6, 1.5.6, and 1.6.0-beta.5.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.1},"cvss_v3":null,"cwes":["CWE-601"],"references":["https://github.com/saltcorn/saltcorn/security/advisories/GHSA-f3g8-9xv5-77gv","https://github.com/saltcorn/saltcorn/security/advisories/GHSA-f3g8-9xv5-77gv"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-42259","score":0.00339,"percentile":0.27365,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-f3g8-9xv5-77gv","url":"https://osv.dev/vulnerability/GHSA-f3g8-9xv5-77gv","summary":"Saltcorn: Open Redirect in `POST /auth/login` due to incomplete `is_relative_url` validation (backslash bypass)","modified":"2026-05-11T13:53:18.140132Z","packages":[{"ecosystem":"npm","name":"@saltcorn/server","purl":"pkg:npm/%40saltcorn/server","ranges":["<1.4.6"],"fixed":["1.4.6"]},{"ecosystem":"npm","name":"@saltcorn/server","purl":"pkg:npm/%40saltcorn/server","ranges":[">=1.5.0-beta.0 <1.5.6"],"fixed":["1.5.6"]},{"ecosystem":"npm","name":"@saltcorn/server","purl":"pkg:npm/%40saltcorn/server","ranges":[">=1.6.0-alpha.0 <1.6.0-beta.5"],"fixed":["1.6.0-beta.5"]}]}],"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."]}