LOW
CVE-2026-27860
CWE-90Published: March 27, 2026· Updated: Mar 30, 2026
3.7
CVSS v3.1
EPSS:0.05%probability of exploitation in 30 daysPercentile:14.7th
Official Description
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.
Technical Analysis
CVE-2026-27860 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
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Rapid7 / Metasploit
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PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (1)
Quick Facts
CVE IDCVE-2026-27860
CVSS Score3.7 / 10
SeverityLOW
WeaknessCWE-90
CISA KEVNo
EPSS (30d)0.05%
PublishedMar 27, 2026
Related CVEs (CWE-90)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-27860 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.