{"id":"CVE-2026-87859","revision":null,"records":[{"revision":"43d1757a699d41e3929e458bc9dd02bc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-87859","aliases":[],"title":"morgan vulnerable to Log Injection via unescaped double quote in quoted log fields","description":"morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emits. An unauthenticated remote attacker who controls a value written to a quoted field, such as the User-Agent or Referer header, can include a double quote to close that field early, so a log consumer that parses the log by field position reads attacker-supplied text as the following field. In the built-in formats this makes the recorded value differ from the value that was sent, and in custom formats that quote an attacker-controlled token before a server-controlled one it can forge values such as the response status. No newline is injected, so record separation stays intact. The issue is fixed in morgan 1.12.1, which escapes the double quote. Users should upgrade to morgan 1.12.1 or later.","state":0,"publishedAt":"2026-09-11T09:15:19.109+00:00","modifiedAt":"2026-09-11T11:32:10.246+00:00","affected":[{"ecosystem":"Vendor product","name":"morgan","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"morgan\",\n                    \"product\": \"morgan\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"1.12.1\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"1.12.1\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/morgan\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/expressjs/morgan/security/advisories/GHSA-9f6g-j8ch-79g4","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-87859","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-87859","identifiers":["CVE-2026-87859"]},"retained":false,"historicalAffected":[]},{"revision":"0afc076e644c426dbaa478bd7c13f6b4","observedAt":"2026-11-11T17:03:05.313+00:00","statement":{"source":"euvd","id":"EUVD-2026-76027","aliases":["CVE-2026-87859","GHSA-9f6g-j8ch-79g4"],"title":"morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emi…","description":"morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emits. An unauthenticated remote attacker who controls a value written to a quoted field, such as the User-Agent or Referer header, can include a double quote to close that field early, so a log consumer that parses the log by field position reads attacker-supplied text as the following field. In the built-in formats this makes the recorded value differ from the value that was sent, and in custom formats that quote an attacker-controlled token before a server-controlled one it can forge values such as the response status. No newline is injected, so record separation stays intact. The issue is fixed in morgan 1.12.1, which escapes the double quote. Users should upgrade to morgan 1.12.1 or later.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":null}],"references":["https://github.com/expressjs/morgan/security/advisories/GHSA-9f6g-j8ch-79g4","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-76027","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 11, 2026, 9:15:19 AM","dateUpdated":"Sep 11, 2026, 11:32:10 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-76027","identifiers":["EUVD-2026-76027","CVE-2026-87859","GHSA-9f6g-j8ch-79g4"]},"retained":false,"historicalAffected":[]},{"revision":"a6bce1b2c4804f67b4b3593ba6498cf2","observedAt":"2026-10-25T16:19:22.228+00:00","statement":{"source":"nvd","id":"CVE-2026-87859","aliases":[],"title":"morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emi…","description":"morgan is an HTTP request logger middleware for Node.js. In versions before 1.12.1, its escapeLogField() function does not escape the double quote character, which delimits the quoted fields of the Apache combined log format that morgan emits. An unauthenticated remote attacker who controls a value written to a quoted field, such as the User-Agent or Referer header, can include a double quote to close that field early, so a log consumer that parses the log by field position reads attacker-supplied text as the following field. In the built-in formats this makes the recorded value differ from the value that was sent, and in custom formats that quote an attacker-controlled token before a server-controlled one it can forge values such as the response status. No newline is injected, so record separation stays intact. The issue is fixed in morgan 1.12.1, which escapes the double quote. Users should upgrade to morgan 1.12.1 or later.","state":0,"publishedAt":"2026-09-11T10:16:53.253+00:00","modifiedAt":"2026-09-16T19:40:00.317+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3,"severity":"MEDIUM"}],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/expressjs/morgan/security/advisories/GHSA-9f6g-j8ch-79g4"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87859","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-117"],"productCriteria":[],"sourceDates":{"published":"2026-09-11T10:16:53.253","lastModified":"2026-09-16T19:40:00.317"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-87859","identifiers":["CVE-2026-87859"]},"retained":false,"historicalAffected":[]},{"revision":"6a7a0f7fe4f14e77aacadc9cbc728c6f","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-9f6g-j8ch-79g4","aliases":["CVE-2026-87859"],"title":"morgan vulnerable to Log Injection via unescaped double quote in quoted log fields","description":"### Impact\n\nMorgan writes attacker-controlled request data to the access log. Its escaping (added in 1.11.0 and 1.12.0) neutralizes control characters, the Unicode line separators, and backslash, but not the double quote (`0x22`), which is the field delimiter of the Apache combined log format morgan emits. An attacker who controls a quoted field (`:user-agent`, `:referrer`, the request URL, or the Basic auth `:remote-user`) can inject a double quote to close the field early and forge additional fields in the log record. The `combined`, `common`, and `default` formats, and any custom format that quotes a token, are affected. This is an incomplete fix of CVE-2026-5078 and CVE-2026-15603.\n\n### Patches\n\nUsers should upgrade to version 1.12.1.\n\n### Workarounds\n\nUpdate to version 1.12.1.","state":0,"publishedAt":"2026-09-28T21:33:08+00:00","modifiedAt":"2026-09-28T21:45:03.8580409+00:00","affected":[{"ecosystem":"npm","name":"morgan","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.12.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/expressjs/morgan/security/advisories/GHSA-9f6g-j8ch-79g4","https://nvd.nist.gov/vuln/detail/CVE-2026-87859","https://github.com/expressjs/morgan/commit/4b695edf967ce179cdf4009fe8cddd184b7511ee","https://cna.openjsf.org/security-advisories.html","https://github.com/expressjs/morgan","https://github.com/expressjs/morgan/releases/tag/1.12.1"],"sourceUrl":"https://github.com/advisories/GHSA-9f6g-j8ch-79g4","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9f6g-j8ch-79g4","identifiers":["GHSA-9f6g-j8ch-79g4","CVE-2026-87859"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T07:54:58.2349119+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T07:54:58.2349119+00:00","lastSuccessAt":"2026-11-12T07:54:58.4848198+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:54:58.4848225+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-1225a640a70b576ed1a85d2671a302d70a8e18168f570c1f4912faf8f66b1119","complete":true,"records":424623,"lastAttemptAt":"2026-11-12T07:53:22.876714+00:00","lastSuccessAt":"2026-11-12T07:53:22.8444514+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:53:22.876714+00:00","snapshotPublishedAt":"2026-11-12T07:24:53+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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