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webpy — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-79311

webpy web.py 0.76 is vulnerable to Cross Site Scripting (XSS) via render_jinja.__init__().

Products
webpy
Affected versions
1:0.37+20120626-1, 1:0.37+20120626-1ubuntu0.1~esm1, 1:0.38+20170615-1, 1:0.38+20170615-1ubuntu0.1~esm1, 1:0.38-1, 1:0.39+20181101-1, 1:0.40-2, 1:0.40-2ubuntu0.1~esm1, 1:0.61-1, 1:0.61-1ubuntu0.1~esm1, 1:0.62-4, 1:0.62-4ubuntu0.1~esm1, 1:0.62-6, 1:0.70-1, 1:0.76-1
Fixed versions
Not specified
CVEs
CVE-2026-79311
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 01:32 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-79311

core-osv · Original source

Published 22 Sept 2026, 16:17 UTC

webpy web.py 0.76 is vulnerable to Cross Site Scripting (XSS) via render_jinja.__init__().

osv:UBUNTU-CVE-2026-79311

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

webpy

Fixed versions: Not specified

Complete source record
{
  "id": "2d61f61c67976680678ef013b9d767ff59382adb1b94ef4504dd60b63d67e736",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-79311",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-79311",
    "summary": "webpy web.py 0.76 is vulnerable to Cross Site Scripting (XSS) via render_jinja.__init__().",
    "evidence": "osv:UBUNTU-CVE-2026-79311",
    "products": [
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.37+20120626-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1:0.37+20120626-1ubuntu0.1~esm1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.38-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:0.38+20170615-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1:0.38+20170615-1ubuntu0.1~esm1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.39+20181101-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1:0.40-2",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "1:0.40-2ubuntu0.1~esm1",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.61-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "1:0.61-1ubuntu0.1~esm1",
            "evidence": "/affected/3/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/4/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.62-4",
            "evidence": "/affected/4/versions"
          },
          {
            "value": "1:0.62-4ubuntu0.1~esm1",
            "evidence": "/affected/4/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/5/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.62-6",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:0.70-1",
            "evidence": "/affected/5/versions"
          },
          {
            "value": "1:0.76-1",
            "evidence": "/affected/5/versions"
          }
        ]
      },
      {
        "name": {
          "value": "webpy",
          "evidence": "/affected/6/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1:0.62-6",
            "evidence": "/affected/6/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-79311",
      "aliases": [
        "UBUNTU-CVE-2026-79311"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=esm-apps-legacy%2Fxenial",
            "ecosystem": "Ubuntu:Pro:16.04:LTS"
          },
          "versions": [
            "1:0.37+20120626-1",
            "1:0.37+20120626-1ubuntu0.1~esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python-webpy",
                "binary_version": "1:0.37+20120626-1ubuntu0.1~esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=esm-apps%2Fbionic",
            "ecosystem": "Ubuntu:Pro:18.04:LTS"
          },
          "versions": [
            "1:0.38-1",
            "1:0.38+20170615-1",
            "1:0.38+20170615-1ubuntu0.1~esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python-webpy",
                "binary_version": "1:0.38+20170615-1ubuntu0.1~esm1"
              },
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.38+20170615-1ubuntu0.1~esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=esm-apps%2Ffocal",
            "ecosystem": "Ubuntu:Pro:20.04:LTS"
          },
          "versions": [
            "1:0.39+20181101-1",
            "1:0.40-2",
            "1:0.40-2ubuntu0.1~esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.40-2ubuntu0.1~esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=esm-apps%2Fjammy",
            "ecosystem": "Ubuntu:Pro:22.04:LTS"
          },
          "versions": [
            "1:0.61-1",
            "1:0.61-1ubuntu0.1~esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.61-1ubuntu0.1~esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=esm-apps%2Fnoble",
            "ecosystem": "Ubuntu:Pro:24.04:LTS"
          },
          "versions": [
            "1:0.62-4",
            "1:0.62-4ubuntu0.1~esm1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.62-4ubuntu0.1~esm1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1:0.62-6",
            "1:0.70-1",
            "1:0.76-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.76-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "webpy",
            "purl": "pkg:deb/ubuntu/webpy?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1:0.62-6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-79311.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-webpy",
                "binary_version": "1:0.62-6"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:57:05.327668037Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-79311"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-79311",
        "https://www.cve.org/CVERecord?id=CVE-2026-79311",
        "https://github.com/lichoin/TraceLoom/blob/main/CVEs/CVE-2026-79311.md",
        "https://github.com/webpy/webpy"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-79311",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 356702,
  "published_at": "2026-09-22T16:17:00+00:00"
}