CVE-2026-121560
LogChimp before 0.9.3 Authorization Bypass via PATCH /api/v1/posts
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | logchimp |
| Product | logchimp |
| Published | Nov 3, 2026 |
| Last Updated | Nov 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
logchimp / logchimp
0.9.0-alpha.1 < 0.9.3
References
github.com: https://github.com/logchimp/logchimp/commit/a78b69af342908472ad400285187e43729295a7c github.com: https://github.com/logchimp/logchimp github.com: https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/controllers/post/updatePost.ts#L67 github.com: https://github.com/logchimp/logchimp/blob/v0.9.2/packages/server/src/middlewares/postExists.ts#L72-L77 github.com: https://github.com/logchimp/logchimp/releases/tag/v0.9.3 vulncheck.com: https://www.vulncheck.com/advisories/logchimp-before-0.9.3-authorization-bypass-via-patch-api-v1-posts
Credits
leediay153 from Viettel Post mittalyashu