CVE-2026-72861

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Source

https://cve.org/CVERecord?id=CVE-2026-72861

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72861.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-72861

Published

2026-08-20T19:48:51Z

Modified

2026-08-23T03:42:38Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N CVSS Calculator

Summary

Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72861.json"
}

References

Affected packages

Git / github.com/appwrite/templates

Affected ranges

Type

GIT

Repo

https://github.com/appwrite/templates

Events

Introduced

Last Affected

dcb00987a777afb3d29f20ea8023070c30e6a949

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.1.2"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

0.*

0.1.0

0.2.0

0.2.1

0.2.2

0.2.3

0.3.0

0.3.1

1.*

1.0.0

1.0.1

1.1.0

1.1.1

1.1.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72861.json"