Use of a Broken or Risky Cryptographic Algorithm Affecting mattermost-11.1 package, versions <11.1.3-r8


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.35% (27th percentile)

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  • Snyk IDSNYK-WOLFILATEST-MATTERMOST111-17800478
  • published2 Jul 2026
  • disclosed11 Aug 2020

Introduced: 11 Aug 2020

CVE-2020-8911  (opens in a new tab)
CWE-327  (opens in a new tab)

How to fix?

Upgrade Wolfi mattermost-11.1 to version 11.1.3-r8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mattermost-11.1 package and not the mattermost-11.1 package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

A padding oracle vulnerability exists in the AWS S3 Crypto SDK for GoLang versions prior to V2. The SDK allows users to encrypt files with AES-CBC without computing a Message Authentication Code (MAC), which then allows an attacker who has write access to the target's S3 bucket and can observe whether or not an endpoint with access to the key can decrypt a file, they can reconstruct the plaintext with (on average) 128*length (plaintext) queries to the endpoint, by exploiting CBC's ability to manipulate the bytes of the next block and PKCS5 padding errors. It is recommended to update your SDK to V2 or later, and re-encrypt your files.

CVSS Base Scores

version 3.1