CVE-2026-40927Network attack vector

Stored XSS via executable comment links

Published Apr 21, 2026 · Updated Apr 21, 2026

Stored cross-site scripting in Docmost 0.71.1 and earlier allows remote authenticated users to execute JavaScript through comment links. Comment link handling accepts and preserves a javascript URI instead of rejecting the executable scheme before the comment is rendered. A workspace user must post the crafted comment and a victim must click its link; execution is limited to the victim's browser context.

CVSS severity4.1
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Docmost 0.71.1 and earlier allows remote authenticated users to execute JavaScript through comment links. Comment link handling accepts and preserves a javascript URI instead of rejecting the executable scheme before the comment is rendered. A workspace user must post the crafted comment and a victim must click its link; execution is limited to the victim's browser context.

The record

CVE
CVE-2026-40927
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Docmost
Product
Docmost
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.80.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Docmost · Docmostversion=< 0.80.0

Published CVSS scores

4.1GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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