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TI-2026-26507 Aliases CVE-2026-34212

Docmost page content has stored XSS via unsanitized attachment URLs

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Docmost is open-source collaborative wiki and documentation software. In versions prior to 0.71.0, improper neutralization of attachment URLs in Docmost allows a low-privileged authenticated user to store a malicious `javascript:` URL inside an attachment node in page content. When another user views the page and activates the attachment link/icon, attacker-controlled JavaScript executes in the context of the Docmost origin. Version 0.71.0 patches the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00208 11th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed docmost (docmost): 0.71.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
docmostdocmostbefore 0.71.00.71.0Patch availableCNA
  • docmost Vendordocmost Affected before 0.71.0 Fixed in 0.71.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:*before 0.71.0Vulnerabledocmost
  • cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:* Versions before 0.71.0 Vulnerable ·docmost

Remediation

  • Fix · CNA docmost (docmost) Fixed in 0.71.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34212

References

Exploit 1

  • TI-2026-17859 Docmost affected by an Arbitrary File Write via Zip Import Feature (ZipSlip) CVSS 3.1CRITICAL 9.8
  • TI-2026-19373 Docmost Affected by Stored XSS in Public Share Page CVSS 3.1HIGH 7.3
  • TI-2025-35043 Cross Site Scripting vulnerability in docmost v.0.21.0 and before allows an attacker to execute arbitrary code CVSS 3.1MEDIUM 6.1
  • TI-2026-19029 Docmost is vulnerable to stored Cross-Site Scripting (XSS) through Mermaid rendering CVSS 4.0MEDIUM 6.3
  • TI-2026-26508 Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation CVSS 3.1MEDIUM 5.4
  • TI-2026-29581 Docmost: XSS in Comments with JavaScript URI CVSS 3.1MEDIUM 5.4
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences