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CVE-2026-72861— Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent

CVSS 5.8 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProductVersion RangeStatus
appwritetemplates≤ 1.1.2affected
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I. Basic Information for CVE-2026-72861

Vulnerability Information
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Vulnerability Title
Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
appwritetemplates 0 ~ 1.1.2 -

II. Public POCs for CVE-2026-72861

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III. Intelligence Information for CVE-2026-72861

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Vendor Advisories for CVE-2026-72861 (1)

Proof of Concept for CVE-2026-72861 (1)

Other References for CVE-2026-72861 (3)

IV. Related Vulnerabilities

Same vendor: appwrite
Same weakness: CWE-347

V. Comments for CVE-2026-72861

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