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CVE-2026-40873

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3f25b16dc691b8c33cab32076253decc61fff0b59bd47bb5f47c085cbba33623
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-80","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"mailcow-dockerized","vendor":"mailcow","versions":[{"status":"affected","version":"< 2026-03b"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-80","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/adp/0/references/0
{"name":"https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvpp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9fd9bf95fa4b0272f819ea39e8b347f17e04cc823109a0f7fa33318f0eb9446a · sha256:a524fe694935ff16… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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