How severe is CVE-2026-34213?

CVE-2026-34213 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.

Is CVE-2026-34213 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34213?

CVE-2026-34213 affects Docmost. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34213?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34213 have an EU (EUVD) identifier?

Yes. CVE-2026-34213 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22756.

When was CVE-2026-34213 published?

CVE-2026-34213 was published on 2026-04-14 and last updated on 2026-06-17.

CVE-2026-34213

CVE-2026-34213 is a medium-severity vulnerability in Docmost with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-22756
Weakness: CWE-639
Affected product: Docmost
Published: 2026-04-14
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-34213?: 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.
How severe is CVE-2026-34213?: CVE-2026-34213 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
Is CVE-2026-34213 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34213?: CVE-2026-34213 affects Docmost. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34213?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34213 have an EU (EUVD) identifier?: Yes. CVE-2026-34213 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-22756.
When was CVE-2026-34213 published?: CVE-2026-34213 was published on 2026-04-14 and last updated on 2026-06-17.

References

https://github.com/docmost/docmost/security/advisories/GHSA-89fp-2hch-j9gp

Affected products (1)

cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:*

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