CVE-2026-121560

    Dashboard / Vulnerabilities / CVE-2026-121560

    CVE-2026-121560

    Published: 3 Nov 2026Last Modified: 5 Nov 2026

    Summary: LogChimp before 0.9.3 Authorization Bypass via PATCH /api/v1/posts

    Details: LogChimp 0.9.0-alpha.1 before 0.9.3 contains an authorization bypass vulnerability that allows authenticated post authors to modify any other post by supplying mismatched postId and id body parameters. Attackers can set postId to their own post and id to an enumerated victim post UUID to overwrite its title, slug, content, boardId and roadmap_id.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121560.json, https://github.com/logchimp/logchimp/releases/tag/v0.9.3, https://nvd.nist.gov/vuln/detail/CVE-2026-121560, https://www.vulncheck.com/advisories/logchimp-before-0.9.3-authorization-bypass-via-patch-api-v1-posts, https://github.com/logchimp/logchimp/commit/a78b69af342908472ad400285187e43729295a7c, https://github.com/logchimp/logchimp, https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/controllers/post/updatePost.ts#L67, https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/middlewares/postExists.ts#L72-L77

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 06728775610438780c9e4ca13a4b7addadc60b97
    Fixed -1c7e55c8557fe5bc91ac27de595461cc0544d627

    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
    CVE-2026-121560 | CVE-DB