CVE-2026-27851

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Summary

CVECVE-2026-27851
StatePUBLISHED
AssignerOX
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-12 14:16:56 UTC
Updated2026-05-18 17:29:09 UTC
DescriptionWhen safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.000160000 probability, percentile 0.038070000 (date 2026-05-26)

Problem Types: CWE-235 | CWE-235 Improper Handling of Extra Parameters

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Dovecot Dovecot All All All All
Application Open-xchange Dovecot All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-Xchange GmbH OX Dovecot Pro affected 3.1.4 semver Not specified
CNA Open-Xchange GmbH OX Dovecot Pro affected 2.4.3 semver Not specified

References

ReferenceSourceLinkTags
documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json [email protected] documentation.open-xchange.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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