CVE•Published 2026-09-09•Modified 2026-09-16•0 articles on news•5 live references•NVD data

CVE-2026-61911Cyrus · Imap

Vulnerability data via NVD (ingested)

CVSS v3.1

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 88% of all CVEs

Weaknesses (CWE)

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere

Description

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

Timeline

Published 2026-09-09

Modified 2026-09-16

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-61911

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Cyrus Imap"

All exposed Cyrus Imap instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Imap"

HTTP body or banner mentions "Imap" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-61911