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CVE-2013-3656

17
FAUCET Score

CVE-2013-3656 describes an authentication bypass vulnerability in Cybozu Office 9.1.0 and earlier, stemming from improper session management. This medium-severity flaw (CVSS 5.8) allows unauthenticated remote attackers to gain unauthorized access by leveraging knowledge of a login URL, potentially leading to partial confidentiality and integrity compromise. Despite its age, there is no public exploit code available, no evidence of active exploitation, and minimal community discussion or media coverage, suggesting it has not been widely targeted.

Impacted Technologies

VendorProductVersion(s)CPE
<= 9.1.0CPE matchmatch criteria
cpe:2.3:a:cybozu:cybozu_office:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.97%
Probability of exploitation in next 30 days
EPSS Percentile
78.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0197 is in the 62nd percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

jvndb.jvn.jp / jvndb/JVNDB-2013-000069
jvn.jp / en/jp/JVN19491840/index.html
products.cybozu.co.jp / office/ver9/download/update/fix910.html
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/85894