CVE-2026-40873General

LOWCVSS 8.9 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79CWE-80

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
General: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

General

1100.0%

Referenced assets1 URL

By indicator

https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40873

Full discourse1 post

Vulmon Vulnerability Feed@VulmonFeeds170d
General
CVE-2026-40873 Cross-Site Scripting in mailcow https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40873
Post summary
The statement references CVE-2026-40873, noting it is a cross‑site scripting flaw in mailcow, but offers no further details on exploitation, remediation, or supporting evidence.
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