CVE-2017-18891: mattermost mattermost_server URL Redirection to Untrusted Site
Vulnerability summary
CVE-2017-18891 is a medium (CVSS 6.1) URL Redirection to Untrusted Site vulnerability in mattermost mattermost_server. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.
Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 19-06-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows Phishing because an error page can have a link.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · GoEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.69%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.69% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Github.com/mattermost1 product
- mattermost-server< 4.0.5 | ≥ 4.1.0, < 4.1.1 | ≥ 4.2.0-rc1, < 4.2.0 | ≥ 4.2.0-rc1+incompatible, < 4.2.0+incompatible
Mattermost1 product
- mattermost_server< 4.0.5 | ≥ 4.1.0, < 4.1.1 | 4.2.0:rc1 | 4.2.0:rc2 | 4.2.0:rc3 | 4.2.0:rc4
2 vendors · 2 products
