{"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"}}}}