CVE-2026-34213: Docmost is open-source collaborative wiki and documentation software

Routine

MEDIUM 5.4UPGRADE

CVE-2026-34213 is a medium-severity flaw (CVSS 5.4) affecting docmost. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-04-14
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: docmost

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 22:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

docmost docmost UPGRADE

Affected: >= 0.3.0 and < 0.71.0

Fixed in: 0.71.0

Safe to downgrade to: a release before 0.3.0

1. Check installed version

apt-cache policy docmost || rpm -q docmost || docmost --version

2. UPGRADE to 0.71.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade docmost

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade docmost

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.3.0 (Debian / Ubuntu)

apt-cache madison docmost sudo apt install docmost=<VERSION_BEFORE_0.3.0> sudo apt-mark hold docmost

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list docmost sudo dnf downgrade docmost-<VERSION_BEFORE_0.3.0> sudo dnf versionlock add docmost

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34213?

docmost: upgrade to 0.71.0. Exact commands for each OS are on this page.

Is CVE-2026-34213 being exploited?

CVE-2026-34213 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34213 affect?

CVE-2026-34213 affects docmost. Severity is medium (CVSS 5.4). 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

How urgent is CVE-2026-34213?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2026-33146 MEDIUM 4.3 UPGRADE Docmost is open-source collaborative wiki and documentation software
CVE-2026-33193 MEDIUM 4.6 UPGRADE Docmost is open-source collaborative wiki and documentation software
CVE-2026-34212 MEDIUM 5.4 UPGRADE Docmost is open-source collaborative wiki and documentation software
CVE-2026-40927 MEDIUM 5.4 UPGRADE Docmost is open-source collaborative wiki and documentation software

References

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