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CVE-2026-53961

nvd nist
Published: Jul 9, 2026Modified: Jul 14, 2026

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6.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Exploitability: 3.9 / Impact: 2.5
Source: security-advisories@github.com (Secondary)

Description

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish validly signed forged Bounce notifications that revoke a targeted user email. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Affected (4)

Products: Discourse: Discourse
Discourse
1 product
Discourse
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Discourse
Discourse
From 2026.1.0 to 2026.1.5
Discourse
From 2026.4.0 to 2026.4.2
Discourse
From 2026.5.0 to 2026.5.1
Discourse
Version 2026.6.0

Related CWEs

CWE-345
Insufficient Verification of Data Authenticity
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

References (9)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
Vendor Advisory

Timeline

No history available yet.