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Chyrp Lite has an IDOR via Mass Assignment in Post Model

Type: advisorySources: OSV

Chyrp Lite is an ultra-lightweight blogging engine. Prior to 2026.01, an IDOR / Mass Assignment issue exists in the Post model that allows authenticated users with post editing permissions (Edit Post, Edit Draft, Edit Own Post, Edit Own Draft) to modify posts they do not own and do not have permission to edit. By passing internal class properties such as id into the post_attributes payload, an attacker can alter the object being instantiated. As a result, further actions are performed on another user’s post rather than the attacker’s own post, effectively enabling post takeover. This vulnerability is fixed in 2026.01.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-35173
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 22:22 UTC · Revision 1

Source evidence

Chyrp Lite has an IDOR via Mass Assignment in Post Model

core-osv · Original source

Published 6 Apr 2026, 17:48 UTC

Chyrp Lite is an ultra-lightweight blogging engine. Prior to 2026.01, an IDOR / Mass Assignment issue exists in the Post model that allows authenticated users with post editing permissions (Edit Post, Edit Draft, Edit Own Post, Edit Own Draft) to modify posts they do not own and do not have permission to edit. By passing internal class properties such as id into the post_attributes payload, an attacker can alter the object being instantiated. As a result, further actions are performed on another user’s post rather than the attacker’s own post, effectively enabling post takeover. This vulnerability is fixed in 2026.01.

osv:CVE-2026-35173
Complete source record
{
  "id": "9abd3f221a3c3091383628e52505f3e5df67530ec99d3e13a1788612ec5d12af",
  "url": "https://osv.dev/vulnerability/CVE-2026-35173",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Chyrp Lite has an IDOR via Mass Assignment in Post Model",
    "summary": "Chyrp Lite is an ultra-lightweight blogging engine. Prior to 2026.01, an IDOR / Mass Assignment issue exists in the Post model that allows authenticated users with post editing permissions (Edit Post, Edit Draft, Edit Own Post, Edit Own Draft) to modify posts they do not own and do not have permission to edit. By passing internal class properties such as id into the post_attributes payload, an attacker can alter the object being instantiated. As a result, further actions are performed on another user’s post rather than the attacker’s own post, effectively enabling post takeover. This vulnerability is fixed in 2026.01.",
    "evidence": "osv:CVE-2026-35173",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-35173",
      "aliases": [
        "CVE-2026-35173",
        "GHSA-8c3h-rh2j-fxr9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/xenocrat/chyrp-lite",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "80f5be189edc107de64b0ee0a09527b96669b443"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.01"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:chyrplite:chyrp_lite:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.01"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2025.03",
            "v2025.02",
            "v2025.01",
            "v2024.03",
            "v2024.02",
            "v2024.01",
            "v2023.03",
            "v2023.02",
            "v2023.01",
            "v2022.03.01",
            "v2022.03",
            "v2022.02",
            "v2022.01",
            "v2021.04",
            "v2021.03",
            "v2021.02",
            "v2021.01",
            "v2020.04",
            "v2020.03",
            "v2020.02",
            "v2020.01",
            "v2019.04",
            "v2019.03",
            "v2019.02",
            "v2019.01",
            "v2018.04"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35173.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.927878161Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35173.json",
        "https://github.com/xenocrat/chyrp-lite/security/advisories/GHSA-8c3h-rh2j-fxr9",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-35173"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639",
          "CWE-914"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35173.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-35173",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490527,
  "published_at": "2026-04-06T17:48:52.681+00:00"
}