GHSA-gxhx-2686-5h9g

    Dashboard / Vulnerabilities / GHSA-gxhx-2686-5h9g

    GHSA-gxhx-2686-5h9g

    Published: 14 May 2026Last Modified: 10 Sept 2026
    Aliases:
    GO-2026-5410

    Summary: slack-go `SecretsVerifier` accepts empty signing secret without precondition

    Details: `SecretsVerifier` in slack-go/slack before v0.23.1 accepts an empty signing secret without error. If an application is misconfigured (e.g., an unset or empty `SLACK_SIGNING_SECRET`), `NewSecretsVerifier` builds an HMAC-SHA256 keyed with an empty string, allowing an unauthenticated attacker to forge a valid `X-Slack-Signature` and bypass Slack request authentication. Fixed in v0.23.1, which rejects empty secrets with `ErrInvalidConfiguration`. This is patched in version 0.23.1.

    References: https://github.com/slack-go/slack/security/advisories/GHSA-gxhx-2686-5h9g, https://github.com/slack-go/slack/commit/34ad5c052e446f58505ae8d81a2a72821de107cc, https://github.com/slack-go/slack, https://github.com/slack-go/slack/releases/tag/v0.23.1

    Affected packages

    Package

    Name: github.com/slack-go/slack

    Purl: pkg:golang/github.com/slack-go/slack

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.23.1

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-gxhx-2686-5h9g | CVE-DB