CVE-2026-34213
Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 5.4EPSS 0.2%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
14 Apr 2026Published on NVD
26 Jun 2026Public PoC
Recommendation: Plan a near-term fix — a public PoC already exists.
Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Affected products
docmost · docmostpublic PoCs found — 1
githubgithub.com/0xmrma/CVE-2026-34213★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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