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CVE-2022-26562

31
FAUCET Score

CVE-2022-26562 is a critical authentication bypass vulnerability affecting Kopano Core versions up to 11.0.2.51 and Zarafa Collaboration Platform (ZCP) versions from 6.30.0 RC1e to 6.30.8. The flaw, located in authentication modules, allows unauthenticated attackers to bypass expired user accounts or passwords. With a CVSSv3.1 score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with low attack complexity, requiring no user interaction. Successful exploitation can lead to complete compromise of confidentiality, integrity, and availability of the affected system. Currently, there is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB. The vulnerability has received minimal community discussion and media coverage, indicating a low level of public awareness despite its critical severity.

Impacted Technologies

VendorProductVersion(s)CPE
11.0.2.51CPE matchmatch criteria
cpe:2.3:a:kopano:groupware_core:11.0.2.51:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.12%
Probability of exploitation in next 30 days
EPSS Percentile
79.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0212 is in the 69th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

bodhi.fedoraproject.org / updates/FEDORA-EPEL-2023-342b96903b
bugzilla.redhat.com / show_bug.cgi
github.com / Kopano-dev/kopano-core/blob/master/provider/libserver/ECKrbAuth.cpp
jira.kopano.io / browse/KC-2021
kopano.com
Vendor Advisory
lists.debian.org / debian-lts-announce/2023/03/msg00006.html
src.fedoraproject.org / rpms/zarafa/c/a5a8366ccf07f248fae6edffb5123cfda579bfdb
stash.kopano.io / projects/KC/repos/kopanocore/browse/provider/libserver/ECKrbAuth.cpp
ExploitVendor Advisory