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CVE-2026-72861

templates · Vulnerability

CVSS 3.1 5.8 MEDIUMCVSS 4.0 6.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-72861

Published

The github-issue-bot templates in appwrite/templates verify the GitHub webhook signature with an inverted condition. verifyWebhook in node/github-issue-bot/src/github.js and in node-typescript/github-issue-bot/src/github.ts returns "typeof signature !== 'string' || (await verify(...))", so when the X-Hub-Signature-256 header is absent the first operand is true, the logical OR short-circuits, and the function reports success without performing any HMAC verification. main.js rejects a request only when verifyWebhook returns false, so an unauthenticated request carrying no signature passes the check. Processing then continues to postComment, which takes the repository and issue objects directly from the request body, letting the caller direct the deployed function to post a comment on a repository and issue of their choosing using the configured GITHUB_TOKEN, with the issue author login from the body interpolated into the comment text.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-72861

Published

templates

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "appwrite",
                    "product": "templates",
                    "defaultStatus": "unaffected",
                    "repo": "https://github.com/appwrite/templates",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "1.1.2",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programFiles": [
                        "node/github-issue-bot/src/github.js",
                        "node-typescript/github-issue-bot/src/github.ts"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON