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Fencer Vulns
medium 5.3

CVE-2023-5969 json

Denial of Service via Link Preview in /api/v4/redirect_location

published 2023-11-06 3 y ago modified 2026-06-17 4 mo ago also GHSA-w496-f5qq-m58j , EUVD-2023-3048

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

Mattermost fails to properly sanitize the request to /api/v4/redirect_location allowing an attacker, sending a specially crafted request to /api/v4/redirect_location, to fill up the memory due to caching large items.

Patch / fix

  • go github.com/mattermost/mattermost-server/v6 7.8.12
  • go github.com/mattermost/mattermost/server/v8 8.0.4, 8.1.3, 9.0.1
  • Mattermost Mattermost 7.8.12, 8.0.4, 8.1.3, 9.0.1

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost-server/v6
<7.8.12
7.8.12
go github.com/mattermost/mattermost/server/v8
>=8.0.0, <8.0.4
>=8.1.0, <8.1.3
>=9.0.0, <9.0.1
8.0.4
8.1.3
9.0.1

Affected products

  • Mattermost Mattermost

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.