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CVE-2026-27855

Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid. An attacker able to observe an OTP exchange is able to log in as the user. If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM. No publicly available exploits are kno
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a158ede45b8a7d166869b262cdc20e700c49011216957fdbcd62d248bc0b8a72
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","modules":["core"],"product":"OX Dovecot Pro","vendor":"Open-Xchange GmbH","versions":[{"lessThanOrEqual":"2.3.0","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a1017b3a52209ab943588ecb2db7c89e098bb9a3a1919f01e0ca2172e61aa173 · sha256:d1594408068a2043… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a1017b3a52209ab943588ecb2db7c89e098bb9a3a1919f01e0ca2172e61aa173 · sha256:d1594408068a2043… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-294","description":"Authentication Bypass by Capture-replay","lang":"en","type":"cwe"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a1017b3a52209ab943588ecb2db7c89e098bb9a3a1919f01e0ca2172e61aa173 · sha256:d1594408068a2043… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"tags":["vendor-advisory"],"url":"https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a1017b3a52209ab943588ecb2db7c89e098bb9a3a1919f01e0ca2172e61aa173 · sha256:d1594408068a2043… · /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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