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                "id": "CVE-2026-77463",
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          "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."
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          "descriptions": [
            {
              "cweId": "CWE-807",
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          "name": "https://github.com/umputun/remark42/pull/2116",
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          "url": "https://github.com/umputun/remark42/pull/2116"
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        {
          "name": "https://github.com/umputun/remark42/pull/2118",
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        {
          "name": "https://github.com/umputun/remark42/releases/tag/backend/v1.16.2",
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          "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": [
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          "url": "https://remark42.com/docs/configuration/parameters/#trusted-proxies-and-client-ip"
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        "advisory": "GHSA-56x6-q882-mf27",
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      "title": "Remark42: Rate limit bypass via unconditional trust of X-Forwarded-For/X-Real-IP headers in direct-internet deployment"
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        "title": "CISA ADP Vulnrichment"
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        {
          "lang": "en",
          "value": "Remark42 is a self-hosted comment engine for blogs, articles, or any other place where readers can add comments. Versions 1.6.0 through 1.15.0 contain a Cross-Site Scripting (XSS) vulnerability exploitable through content-type spoofing. The Remark42 image proxy fetches an arbitrary remote URL and re-serves the response from Remark42\u0027s own origin. During the download phase, the proxy determines whether the resource is an image by inspecting only the Content-Type header advertised by the remote server, never examining the actual bytes; during the serving phase, it instead derives the response Content-Type by sniffing those bytes with http.DetectContentType. An attacker can exploit this inconsistency by hosting a URL that advertises Content-Type: image/png while returning an HTML/JavaScript body: the download check accepts it as an image, the serving path sniffs the body and emits Content-Type: text/html, and the browser renders the attacker-controlled HTML/JavaScript as a document within Remark42\u0027s origin. Exploitation requires no Remark42 account on the target instance; the attacker only needs to host the malicious upstream URL and deliver the proxy link to a victim by any means, such as email, direct message, or a link on another website. This issue has been fixed in version 1.16.0."
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            "version": "3.0"
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
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          ]
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        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436: Interpretation Conflict",
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              "type": "CWE"
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          ]
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        "dateUpdated": "2026-06-16T22:29:38.877Z",
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          "name": "https://github.com/umputun/remark42/commit/78d6de6bce1e961f023969da3ec8a00dd80c9ae8",
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          "name": "https://github.com/umputun/remark42/releases/tag/v1.16.0",
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        "advisory": "GHSA-4c8j-mgm4-qqvp",
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      "title": "Remark42: Cross-Site Scripting (XSS) on /api/v1/img via content-type spoofing"
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