Exploitation evidence
Not listed in the latest downloaded CISA KEV catalog. This does not establish an absence of exploitation.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
umputun / remark42
Default status: Not specified
- affected: >= 1.0.0, < 1.16.2
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27
- https://github.com/umputun/remark42/pull/2116
- https://github.com/umputun/remark42/pull/2118
- https://github.com/umputun/remark42/commit/b1502801facd7782a1c70fd51f8ad5c2eb650d39
- https://github.com/umputun/remark42/commit/e62b3c830d81659cf5d2687b0c8261da7d42fdab
- https://github.com/umputun/remark42/releases/tag/backend/v1.16.2
- https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip
Monitored source mentions
Shared CVE identifiers link source mentions; they do not establish that the reports describe the same incident.
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.00219,
"percentile": 0.12512
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.00219,
"percentile": 0.12477
}10 Nov 2026, 12:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.00219,
"percentile": 0.1245
}10 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-77463",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-11-10T04:19:02.667896Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-11-10T04:20:00.888Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/umputun/remark42/security/advisories/GHSA-56x6-q882-mf27"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "remark42",
"vendor": "umputun",
"versions": [
{
"status": "affected",
"version": ">= 1.0.0, < 1.16.2"
}
]
}
],
"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."
}
],
"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"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-348",
"description": "CWE-348: Use of Less Trusted Source",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-807",
"description": "CWE-807: Reliance on Untrusted Inputs in a Security Decision",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-05T20:54:09.798Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"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"
}
],
"source": {
"advisory": "GHSA-56x6-q882-mf27",
"discovery": "UNKNOWN"
},
"title": "Remark42: Rate limit bypass via unconditional trust of X-Forwarded-For/X-Real-IP headers in direct-internet deployment"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-77463",
"datePublished": "2026-11-05T20:54:09.798Z",
"dateReserved": "2026-08-20T20:07:49.962Z",
"dateUpdated": "2026-11-10T04:20:00.888Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}