CVE-2023-5330

Denial of Service via Opengraph Data Cache

HIGH

7.5

CVSS Score

Published: October 9, 2023 at 10:38 AM UTC

Updated: June 17, 2026 at 06:48 AM UTC

2 products affected across 1 vendorMattermost ServerMattermost

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

Mattermost fails to enforce a limit for the size of the cache entry for OpenGraph data allowing an attacker to send a specially crafted request to the /api/v4/opengraph filling the cache and turning the server unavailable.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mattermost Server · Mattermost

95%

v < 7.8.118.0.0 ≤ v < 8.0.38.1.0 ≤ v < 8.1.2

Affected range stops below 7.8.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.0.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.1.2, so it looks safe — our inference, not a vendor statement

Mattermost · Mattermost

60%

v ≤ 7.8.10v ≤ 8.0.2v ≤ 8.1.1

Vendor states this is fixed in 7.8.11 (unaffected)

Vendor states this is fixed in 8.0.3 (unaffected)

Vendor states this is fixed in 8.1.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://mattermost.com/security-updates

References (1)

Vendor Advisory

Source: [email protected]

https://mattermost.com/security-updates

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-400CWE-770

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