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CVE-2023-1777

19
FAUCET Score

CVE-2023-1777 is a medium-severity information disclosure vulnerability affecting Mattermost Server. An attacker can exploit a flaw in the createPost API call to request a preview of an existing message, thereby disclosing its contents. This vulnerability has a CVSS score of 5.3, indicating a low impact on confidentiality with no integrity or availability impact. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 7.1.6CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
7.7.1CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:7.7.1:*:*:*:*:*:*:*
7.8.0CPE matchmatch criteria
cpe:2.3:a:mattermost:mattermost_server:7.8.0:*:*:*:*:*:*:*
>= 6.3.0, <= 7.1.5CPE match
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*
>= 6.3.0, <= 7.7.1CPE match
cpe:2.3:a:mattermost:mattermost:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.54%
Probability of exploitation in next 30 days
EPSS Percentile
42.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 27th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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

Patch Available

Vendor Patches (6)

gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-server/v6Fixed in: 7.1.6
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 7.8.1
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 7.7.2
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 7.1.6
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-server/v6Fixed in: 6.0.0-20230301145909-10be118d99a5
gopatch availablevia ghsa
Product: github.com/mattermost/mattermost-serverFixed in: 1.4.1-0.20230301145909-10be118d99a5

Vendor Advisories (1)

goGHSA-3wq5-3f56-v5xcmedium

Mattermost vulnerable to information disclosure

Mar 31, 2023

References

mattermost.com / security-updates
Vendor Advisory