CVE-2026-77463
Full vulnerability record from the local CVENow database.
Description
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.
View original CVE JSON
{
"id": "CVE-2026-77463",
"sourceIdentifier": "[email protected]",
"published": "2026-11-05T21:18:53.727",
"lastModified": "2026-11-05T21:18:53.727",
"vulnStatus": "Received",
"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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "umputun",
"product": "remark42",
"versions": [
{
"version": ">= 1.0.0, < 1.16.2",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 3.9,
"impactScore": 2.5
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-348"
},
{
"lang": "en",
"value": "CWE-807"
}
]
}
],
"references": [
{
"url": "https://github.com/umputun/remark42/commit/b1502801facd7782a1c70fd51f8ad5c2eb650d39",
"source": "[email protected]"
},
{
"url": "https://github.com/umputun/remark42/commit/e62b3c830d81659cf5d2687b0c8261da7d42fdab",
"source": "[email protected]"
},
{
"url": "https://github.com/umputun/remark42/pull/2116",
"source": "[email protected]"
},
{
"url": "https://github.com/umputun/remark42/pull/2118",
"source": "[email protected]"
},
{
"url": "https://github.com/umputun/remark42/releases/tag/backend/v1.16.2",
"source": "[email protected]"
},
{
"url": "https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27",
"source": "[email protected]"
},
{
"url": "https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip",
"source": "[email protected]"
}
]
}