CVE-2017-18898
Mattermost Server is vulnerable to DoS through maliciously crafted posts
Reported by mitre · Published June 19, 2020
github.com/mattermost/mattermost-server is fixed in 4.2.0+incompatible, 4.2.0, 4.1.1+incompatible and 3 more (Go Modules)
An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5. It allows crafted posts that potentially cause a web browser to hang.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| github.com/mattermost/mattermost-server | Go Modules | 4.2.0+incompatible, 4.2.0, 4.1.1+incompatible, 4.1.1, 4.0.5+incompatible, 4.0.5 |
| mattermost_server | mattermost | 4.1.1, 4.0.5 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| github.com | mattermost/mattermost-server | 0, 4.1.0, 4.2.0-rc1 |
| n/a | n/a | * |
Timeline
- Jun 19, 2020 CVE Published
- Jun 19, 2020 PoC Published
- Apr 14, 2021 EPSS Score (30 in total, the first dated here)
- Apr 26, 2026 Security Advisory
- Jun 17, 2026 CVE Updated
- Oct 1, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2017-18898
vulnetix vdb fixes CVE-2017-18898
Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2017-18898/fixes/registry"
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References
- x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2017-18898 advisory
- https://github.com/advisories/GHSA-9589-mq83-f749 advisory
- https://github.com/grundleborg/mattermost/commit/5286318c72aa230f33f89df3b4cbdc33a0822a93 patch
- https://github.com/mattermost/mattermost/commit/5bf6f06c02c368b9c73a8be2d2d8795b3405b22b patch
- https://github.com/mattermost/mattermost/commit/5c22176c963a7393241872073547f30083efe218 patch
- https://github.com/mattermost/mattermost url
- https://mattermost.com/security-updates url