CVE-2026-40020

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imapaclallow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40020.json",
    "cwe_ids": [
        "CWE-284"
    ],
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "last_affected": "2.3.0"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cna_assigner": "OX"
}

References

Affected packages

Git / github.com/dovecot/core

Affected ranges

Type

GIT

Repo

https://github.com/dovecot/core

Events

Introduced

Fixed

8b687aa65c719e2a0d773eccea84f67c5770fc9a

Database specific

{
    "cpe": "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*",
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.4.4"
        }
    ]
}

Affected versions

1.*

1.1.alpha1

1.1.alpha2

1.1.alpha4

1.1.alpha5

1.1.alpha6

1.1.beta1

1.1.beta10

1.1.beta11

1.1.beta12

1.1.beta13

1.1.beta14

1.1.beta16

1.1.beta2

1.1.beta3

1.1.beta4

1.1.beta5

1.1.beta6

1.1.beta8

1.1.beta9

1.1.rc1

1.1.rc2

1.1.rc3

1.2.alpha1

1.2.alpha2

1.2.alpha3

1.2.alpha4

1.2.alpha5

1.2.beta1

1.2.beta2

1.2.beta3

1.2.beta4

1.2.rc1

2.*

2.0.0

2.0.1

2.0.2

2.0.3

2.0.4

2.0.5

2.0.6

2.0.7

2.0.8

2.0.alpha1

2.0.alpha2

2.0.alpha3

2.0.beta1

2.0.beta2

2.0.beta3

2.0.beta4

2.0.beta5

2.0.beta6

2.0.rc1

2.0.rc2

2.0.rc3

2.0.rc4

2.0.rc5

2.0.rc6

2.1.alpha1

2.1.alpha2

2.1.beta1

2.1.rc1

2.1.rc2

2.1.rc3

2.1.rc4

2.1.rc5

2.1.rc6

2.2.0

2.2.1

2.2.10

2.2.11

2.2.12

2.2.13

2.2.13.rc1

2.2.14

2.2.14.rc1

2.2.15

2.2.16

2.2.16.rc1

2.2.17

2.2.17.rc1

2.2.17.rc2

2.2.18

2.2.19

2.2.19.rc1

2.2.19.rc2

2.2.2

2.2.20

2.2.20.rc1

2.2.3

2.2.4

2.2.5

2.2.6

2.2.7

2.2.8

2.2.9

2.2.alpha1

2.2.beta1

2.2.beta2

2.2.rc1

2.2.rc2

2.2.rc3

2.2.rc4

2.2.rc5

2.2.rc6

2.2.rc7

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40020.json"