{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77463", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T20:07:49.962Z", "datePublished": "2026-11-05T20:54:09.798Z", "dateUpdated": "2026-11-05T20:54:09.798Z"}, "containers": {"cna": {"title": "Remark42: Rate limit bypass via unconditional trust of X-Forwarded-For/X-Real-IP headers in direct-internet deployment", "problemTypes": [{"descriptions": [{"cweId": "CWE-348", "lang": "en", "description": "CWE-348: Use of Less Trusted Source", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-807", "lang": "en", "description": "CWE-807: Reliance on Untrusted Inputs in a Security Decision", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27"}, {"name": "https://github.com/umputun/remark42/pull/2116", "tags": ["x_refsource_MISC"], "url": "https://github.com/umputun/remark42/pull/2116"}, {"name": "https://github.com/umputun/remark42/pull/2118", "tags": ["x_refsource_MISC"], "url": "https://github.com/umputun/remark42/pull/2118"}, {"name": "https://github.com/umputun/remark42/commit/b1502801facd7782a1c70fd51f8ad5c2eb650d39", "tags": ["x_refsource_MISC"], "url": "https://github.com/umputun/remark42/commit/b1502801facd7782a1c70fd51f8ad5c2eb650d39"}, {"name": "https://github.com/umputun/remark42/commit/e62b3c830d81659cf5d2687b0c8261da7d42fdab", "tags": ["x_refsource_MISC"], "url": "https://github.com/umputun/remark42/commit/e62b3c830d81659cf5d2687b0c8261da7d42fdab"}, {"name": "https://github.com/umputun/remark42/releases/tag/backend/v1.16.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/umputun/remark42/releases/tag/backend/v1.16.2"}, {"name": "https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip", "tags": ["x_refsource_MISC"], "url": "https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip"}], "affected": [{"vendor": "umputun", "product": "remark42", "versions": [{"version": ">= 1.0.0, < 1.16.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-05T20:54:09.798Z"}, "descriptions": [{"lang": "en", "value": "Remark42 is a self-hosted comment engine for blogs, articles, or any other place where readers can add comments. From 1.0.0 until 1.16.2, Remark42 globally trusts True-Client-IP, X-Real-IP, and X-Forwarded-For without verifying that the direct peer is a trusted proxy, and middleware.RealIP overwrites r.RemoteAddr before per-IP controls run. In a directly reachable deployment, or a proxy that forwards attacker-controlled headers, a remote attacker can rotate spoofed forwarding headers to obtain fresh token buckets for rate-limited endpoints, bypass vote de-duplication when --votes-ip is enabled, mint anonymous identities, and poison stored comment IPs and request logs. The global concurrent-request throttle and per-request timeouts still limit availability impact. Mitigation support is available in version 1.16.2, but operators must configure --trusted-proxy for the deployment topology."}], "source": {"advisory": "GHSA-56x6-q882-mf27", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "remark42", "vendor": "umputun", "versions": [{"status": "affected", "version": ">= 1.0.0, < 1.16.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Remark42 is a self-hosted comment engine for blogs, articles, or any other place where readers can add comments. From 1.0.0 until 1.16.2, Remark42 globally trusts True-Client-IP, X-Real-IP, and X-Forwarded-For without verifying that the direct peer is a trusted proxy, and middleware.RealIP overwrites r.RemoteAddr before per-IP controls run. In a directly reachable deployment, or a proxy that forwards attacker-controlled headers, a remote attacker can rotate spoofed forwarding headers to obtain fresh token buckets for rate-limited endpoints, bypass vote de-duplication when --votes-ip is enabled, mint anonymous identities, and poison stored comment IPs and request logs. The global concurrent-request throttle and per-request timeouts still limit availability impact. Mitigation support is available in version 1.16.2, but operators must configure --trusted-proxy for the deployment topology."}], "id": "CVE-2026-77463", "lastModified": "2026-11-05T21:18:53.727", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-05T21:18:53.727", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/commit/b1502801facd7782a1c70fd51f8ad5c2eb650d39"}, {"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/commit/e62b3c830d81659cf5d2687b0c8261da7d42fdab"}, {"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/pull/2116"}, {"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/pull/2118"}, {"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/releases/tag/backend/v1.16.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27"}, {"source": "security-advisories@github.com", "url": "https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-348"}, {"lang": "en", "value": "CWE-807"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}