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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

Quick assessment

Affected
appwrite templates
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Appwrite Templates是Appwrite公司的一套开发模板集合。 Appwrite Templates 1.1.2及之前版本存在加密问题漏洞，该漏洞源于GitHub webhook签名验证条件反转，缺少X-Hub-Signature-256头时未执行HMAC验证，可能导致未经身份验证的攻击者使用GITHUB_TOKEN在任意仓库和issue上发表评论。

CVSS 5.8 · Medium EPSS 0.27% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
appwrite templates ≤ 1.1.2 affected
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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
Vulnerability Title
Appwrite Templates 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Appwrite Templates是Appwrite公司的一套开发模板集合。 Appwrite Templates 1.1.2及之前版本存在加密问题漏洞，该漏洞源于GitHub webhook签名验证条件反转，缺少X-Hub-Signature-256头时未执行HMAC验证，可能导致未经身份验证的攻击者使用GITHUB_TOKEN在任意仓库和issue上发表评论。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
appwrite templates 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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