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CVE-2026-47083

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross...

4.3 MediumFix available

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.31%Up 0.1 points since Jul 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
CVE-2026-47083
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
EUVDEUVD-2026-45006 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
EUVD-2026-45006
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-7m4j-qx5p-343w 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross...

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
GHSA-7m4j-qx5p-343w
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
NVD 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
CVE-2026-47083
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-204
Updated
2026-11-02
OSVDEBIAN-CVE-2026-47083 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
DEBIAN-CVE-2026-47083
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-47083 4.3

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).

Record
UBUNTU-CVE-2026-47083
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2026:21368-1 No score

Security update for cyrus-imapd

This update for cyrus-imapd fixes the following issues:

Changes in cyrus-imapd:

  • Update to 3.8.7 (bugfix release)
  • CVE-2026-47081: XAPPLEPUSHSERVICE folder existence oracle and push hijack (bsc#1271617)
  • CVE-2026-47083: ESEARCH cross-user content oracle (bsc#1271619)
  • CVE-2026-47082: Vacation "fcc" skips destination-mailbox ACL (bsc#1271618)
  • CVE-2026-47084: LOCALDELETE bypassed ACL checks (bsc#1271620)
  • CVE-2026-47085: URLAUTH token forgery via missing mboxkey (bsc#1271621)
  • CVE-2026-47086: GENURLAUTH issued tokens bypassing ACLs (bsc#1271622)
  • CVE-2026-47087: URLAUTH does not honor revoked authorizer access (bsc#1271623)
  • CVE-2026-47088: Heap exposure in nested MIME comment parsing (bsc#1271624)
  • CVE-2026-47089: LISTRIGHTS not limited to users with admin access (bsc#1271625)
Record
openSUSE-SU-2026:21368-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
cyrus-imapd
Debian:12
 All versions, plus listed versions
3.10.0-13.10.0~beta1-13.10.0~beta1-23.10.0~beta1-33.10.0~beta2-1
Show 40 moreShow less
3.10.0~rc2-13.10.1-13.10.1-23.10.1-33.10.1-3~bpo12+13.10.2-13.10.2-1~bpo12+13.12.0-13.12.0-23.12.1-13.12.1-23.12.1-33.12.2-13.12.3-13.12.3-1~bpo13+13.12.3-23.12.3-33.12.3-43.12.4-13.6.1-43.6.1-4+deb12u13.6.1-4+deb12u23.6.1-4+deb12u33.6.1-4+deb12u43.6.1-4+deb12u53.8.0-13.8.0-23.8.0-33.8.0-43.8.0-53.8.0~beta1-13.8.0~beta2-13.8.0~rc1-13.8.1-13.8.1-1~bpo12+13.8.1-23.8.1-33.8.2-13.8.3-13.8.4-1
 None known
cyrus-imapd
Debian:13
 before 3.10.2-1+deb13u2, plus listed versions
3.10.2-13.10.2-1+deb13u1
3.10.2-1+deb13u2
cyrus-imapd
Debian:14
 before 3.12.3-1, plus listed versions
3.10.2-13.12.0-13.12.0-23.12.1-13.12.1-23.12.1-33.12.2-13.12.3-1~bpo13+1
3.12.3-1
cyrus-imapd
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.5.10-3build12.5.10-3build22.5.10-3ubuntu12.5.10-3ubuntu1.12.5.10-3ubuntu1.1+esm1
 None known
cyrus-imapd
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.0.11-13.0.11-1build13.0.12-13.0.12-23.0.12-2ubuntu2
Show 7 moreShow less
3.0.12-2ubuntu33.0.13-2ubuntu13.0.13-3ubuntu13.0.13-4ubuntu13.0.13-53.0.13-5ubuntu0.1~esm13.0.13-5ubuntu0.1~esm2
 None known
cyrus-imapd
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
3.2.6-2build13.4.2-23.4.2-2build13.4.3-23.4.3-3
Show 5 moreShow less
3.4.3-3build23.4.3-3ubuntu0.13.4.3-3ubuntu0.1+esm13.4.3-3ubuntu0.33.4.3-3ubuntu0.3+esm1
 None known
cyrus-imapd
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
3.8.0-53.8.1-13.8.1-1build13.8.1-1build23.8.1-3
Show 5 moreShow less
3.8.1-3build33.8.2-13.8.2-1ubuntu0.1~esm13.8.2-1ubuntu0.23.8.2-1ubuntu0.2+esm1
 None known
cyrus-imapd
Ubuntu:26.10
 All versions, plus listed versions
3.12.1-33.12.2-13.12.2-1build13.12.3-3build1
 None known
cyrus-imapd
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.10.2-13.12.1-23.12.1-2build13.12.1-3
 None known
cyrus-imapd
openSUSE:Leap 16.0
From an advisory covering 9 CVEs
 before 3.8.7-bp160.1.1
3.8.7-bp160.1.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-47083 is a medium vulnerability (CVSS 4.3) in Cyrusimap Cyrus Imap, published July 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.31%, the 23rd percentile. Fixed in cyrus-imapd 3.10.2-1+deb13u2.

References

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