CVE-2025-26842Network attack vector

Encrypted email disclosure via plaintext communication logging

Published May 8, 2025 · Updated May 8, 2025

Information disclosure in Znuny 7.0.1 through 7.1.3 allows remote authenticated users to read decrypted S/MIME email content. The mail-processing path stores decrypted S/MIME message bodies in the CommunicationLog instead of keeping the plaintext confined to the ticket access boundary. All Znuny LTS 6.0 releases and 6.5.1 through 6.5.11 are also affected; CommunicationLog access exposes message content even when ticket access is denied.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Znuny 7.0.1 through 7.1.3 allows remote authenticated users to read decrypted S/MIME email content. The mail-processing path stores decrypted S/MIME message bodies in the CommunicationLog instead of keeping the plaintext confined to the ticket access boundary. All Znuny LTS 6.0 releases and 6.5.1 through 6.5.11 are also affected; CommunicationLog access exposes message content even when ticket access is denied.

The record

CVE
CVE-2025-26842
Published
May 8, 2025
Updated
May 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2025CVE publishedPublication date reported by the CVE source.
  2. May 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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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-863Incorrect Authorization
T1213Data from Information Repositories

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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