CVE-2023-5331 — File Information Leak via IDOR in file_id in Draft Posts

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MEDIUM

File Information Leak via IDOR in file_id in Draft Posts

Published Oct 9, 2023

5.3

MEDIUM

CVSS 3.1

EPSS 0.32%

Description

Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.

Affected products

Vendor Mattermost Product Mattermost Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <=7.8.10
- Version
  0
  Status
  affected
  Constraints
  <=8.0.2
- Version
  0
  Status
  affected
  Constraints
  <=8.1.1
- Version
  7.8.11
  Status
  unaffected
  Constraints
  -
- Version
  8.0.3
  Status
  unaffected
  Constraints
  -
- Version
  8.1.2
  Status
  unaffected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mattermost

unaffected

Version	Status	Constraints
0	affected	<=7.8.10
0	affected	<=8.0.2
0	affected	<=8.1.1
7.8.11	unaffected	-
8.0.3	unaffected	-
8.1.2	unaffected	-

Remediation

Vendor solution

Update Mattermost Server to versions 7.8.11, 8.0.3, 8.1.2 or higher.

Metrics

0.32% 0.00319

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00319

Score over time

2023–2026

EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v3
EPSS v4
EPSS v5

Table of values (7 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.32% (0.00319)	22.49th	v5 (v2026.06.15)
Jun 15, 2026	0.32% (0.00319)	23.37th	v5 (v2026.06.15)
Mar 17, 2025	0.15% (0.00150)	32.97th	v4 (v2025.03.14)
Dec 12, 2024	0.05% (0.00053)	23.08th	v3 (v2023.03.01)
May 17, 2024	0.05% (0.00046)	16.26th	v3 (v2023.03.01)
Oct 13, 2023	0.05% (0.00046)	14.23th	v3 (v2023.03.01)
Oct 10, 2023	0.04% (0.00043)	7.20th	v3 (v2023.03.01)