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🛡️ CVE-2026-47085

🟡 CVSS 4.0 — Medium ✅ No Known Exploit CWE-340 NVD
4.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-47085 is classified as CWE-340: Generation of Predictable Numbers or Identifiers. The product uses a scheme that generates numbers or identifiers that are more predictable than required.

Affected software

CVE-2026-47085 is recorded against 1 package.

  • unknown

Timeline and source

Published on 16 July 2026 and last revised on 17 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

www.cyrusimap.org
www.cyrusimap.org

Other advisories for this package

unknown has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-340: Generation of Predictable Numbers or Identifiers) in other software:

Details

Severity MEDIUM
CVSS Score 4.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
CWE CWE-340
Public Exploit ✅ No
Source NVD
Published 2026-07-16
Updated 2026-08-20
Modified 2026-07-17
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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