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WID-SEC-W-2026-0891
Vulnerability from csaf_certbund - Published: 2026-03-26 23:00 - Updated: 2026-03-30 22:00Summary
Dovecot: Mehrere Schwachstellen
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Dovecot ist ein Open Source IMAP und POP3 E-Mail Server.
Angriff: Ein Angreifer kann mehrere Schwachstellen in Dovecot ausnutzen, um SQL-Injection-Angriffe durchzuführen, die Authentifizierung zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand herbeizuführen.
Betroffene Betriebssysteme: - Sonstiges
- UNIX
References
{
"document": {
"aggregate_severity": {
"text": "mittel"
},
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
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"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "de-DE",
"notes": [
{
"category": "legal_disclaimer",
"text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
},
{
"category": "description",
"text": "Dovecot ist ein Open Source IMAP und POP3 E-Mail Server.",
"title": "Produktbeschreibung"
},
{
"category": "summary",
"text": "Ein Angreifer kann mehrere Schwachstellen in Dovecot ausnutzen, um SQL-Injection-Angriffe durchzuf\u00fchren, die Authentifizierung zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand herbeizuf\u00fchren.",
"title": "Angriff"
},
{
"category": "general",
"text": "- Sonstiges\n- UNIX",
"title": "Betroffene Betriebssysteme"
}
],
"publisher": {
"category": "other",
"contact_details": "csaf-provider@cert-bund.de",
"name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
"namespace": "https://www.bsi.bund.de"
},
"references": [
{
"category": "self",
"summary": "WID-SEC-W-2026-0891 - CSAF Version",
"url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0891.json"
},
{
"category": "self",
"summary": "WID-SEC-2026-0891 - Portal Version",
"url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0891"
},
{
"category": "external",
"summary": "Dovecot Security Advisory vom 2026-03-26",
"url": "https://dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thread/I4KFFV4IKP6M5MS67SWYHKDSDMSNILQG/"
},
{
"category": "external",
"summary": "openSUSE Security Update OPENSUSE-SU-2026:10442-1 vom 2026-03-30",
"url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/OBSVSMBRLSXDJ3TFA22MX7UVQIY2WIIN/"
}
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"source_lang": "en-US",
"title": "Dovecot: Mehrere Schwachstellen",
"tracking": {
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"generator": {
"date": "2026-03-31T08:09:15.346+00:00",
"engine": {
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"version": "1.5.0"
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{
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"number": "3",
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],
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"version": "3"
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"name": "\u003c2.4.0",
"product": {
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"product_id": "T052218"
}
},
{
"category": "product_version",
"name": "2.4.0",
"product": {
"name": "Open Source Dovecot 2.4.0",
"product_id": "T052218-fixed",
"product_identification_helper": {
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}
},
{
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"name": "\u003c2.4.3",
"product": {
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},
{
"category": "product_version",
"name": "2.4.3",
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"title": "CVE-2026-27858"
},
{
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"title": "CVE-2026-27857"
}
]
}
CVE-2026-24031 (GCVE-0-2026-24031)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:40
VLAI?
EPSS
Summary
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.
Severity ?
7.7 (High)
CWE
- CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.1.0
(semver)
Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2025-59028 (GCVE-0-2025-59028)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:43
VLAI?
EPSS
Summary
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known.
Severity ?
5.3 (Medium)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.1.0
(semver)
Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2026-27856 (GCVE-0-2026-27856)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 13:45
VLAI?
EPSS
Summary
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.
Severity ?
7.4 (High)
CWE
- CWE-287 - Improper Authentication
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
|
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CVE-2026-27857 (GCVE-0-2026-27857)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 12:39
VLAI?
EPSS
Summary
Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections. Install fixed version, there is no other remediation. No publicly available exploits are known.
Severity ?
4.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
|
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CVE-2026-0394 (GCVE-0-2026-0394)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:41
VLAI?
EPSS
Summary
When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial. This allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains passwords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear valid users. Upgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can also ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d. No publicly available exploits are known.
Severity ?
5.3 (Medium)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
|
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CVE-2026-27858 (GCVE-0-2026-27858)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 12:37
VLAI?
EPSS
Summary
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.
Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
Severity ?
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
Affected: 0 , ≤ 3.1.0 (semver) Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2026-27859 (GCVE-0-2026-27859)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 12:35
VLAI?
EPSS
Summary
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time. Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited. No publicly available exploits are known.
Severity ?
5.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.0.2
(semver)
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CVE-2025-30189 (GCVE-0-2025-30189)
Vulnerability from cvelistv5 – Published: 2025-10-31 09:02 – Updated: 2026-03-27 12:33
VLAI?
EPSS
Summary
When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.
Severity ?
7.4 (High)
CWE
- CWE-1250 - Improper Preservation of Consistency Between Independent Representations of Shared State
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.1.0
(semver)
Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2026-27860 (GCVE-0-2026-27860)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 12:33
VLAI?
EPSS
Summary
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.
Severity ?
CWE
- CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.1.0
(semver)
Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2025-59032 (GCVE-0-2025-59032)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:42
VLAI?
EPSS
Summary
ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known.
Severity ?
7.5 (High)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 3.1.0
(semver)
Affected: 0 , ≤ 2.4.0 (semver) |
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CVE-2025-59031 (GCVE-0-2025-59031)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:42
VLAI?
EPSS
Summary
Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments. Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes. Do not use the provided script, instead, use something else like FTS tika. No publicly available exploits are known.
Severity ?
4.3 (Medium)
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
|
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CVE-2026-27855 (GCVE-0-2026-27855)
Vulnerability from cvelistv5 – Published: 2026-03-27 08:10 – Updated: 2026-03-27 19:39
VLAI?
EPSS
Summary
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 known.
Severity ?
6.8 (Medium)
CWE
- CWE-294 - Authentication Bypass by Capture-replay
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Open-Xchange GmbH | OX Dovecot Pro |
Affected:
0 , ≤ 2.3.0
(semver)
|
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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