TI-2026-34687 Aliases CVE-2026-47085 GHSA-8jrh-wq6h-53c4

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2.

LOW 19CWE-340Published 2026-07-16 · Updated 2026-07-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: Low · None · None
Fix status: Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.)

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00297 22nd percentileScored 2026-11-07

Fix Partial Cyrus IMAP (cyrusimap): 3.12.3Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cyrusimap	Cyrus IMAP	before 3.12.3	3.12.3	Patch available	CNA

Cyrus IMAP Vendorcyrusimap Affected before 3.12.3 Fixed in 3.12.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:cyrus:imap::::::::	—	—	Cyrus

cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:* Versions — — ·Cyrus

Remediation

Fix · CNA Cyrus IMAP (cyrusimap) Fixed in 3.12.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-07-16
cyrusimap Cyrus IMAP 3.12.3
9 records Highest priority Priority LOW 9 LOW
Other records, highest priority first
- TI-2026-34686 Incorrect authorization in cyrusimap Cyrus IMAPPriority LOW 29
- TI-2026-34684 Incorrect authorization in cyrusimap Cyrus IMAPPriority LOW 24
- TI-2026-34691 Missing authorization in cyrusimap Cyrus IMAPPriority LOW 20
Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-47085
2026-10-03 Alias added: GHSA-8jrh-wq6h-53c4

References

Other 2

TI-2002-01271 Multiple buffer overflows in Cyrus SASL library 2.1.9 and earlier allow remote attackers… CVSS 3.1CRITICAL 9.8
TI-2022-08283 In Cyrus SASL 2.1.17 through 2.1.27 before 2.1.28, plugins/sql.c does not escape the… CVSS 3.1HIGH 8.8
TI-2019-14353 cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated… CVSS 3.1HIGH 7.5
TI-2026-44296 Double free in cyrusimap Cyrus IMAP CVSS 3.1HIGH 7.1
TI-2017-09510 Cyrus IMAP before 3.0.3 allows remote authenticated users to write to arbitrary files via… CVSS 3.0MEDIUM 6.5
TI-2024-22515 Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to… CVSS 3.1MEDIUM 6.5

See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences