What’s Vulnerable › Vulnerabilities

CVE-2023-36829: Sentry CORS misconfiguration vulnerability

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-06 · updated 2026-06-17
• Weakness: CWE-863

Description

Sentry is an error tracking and performance monitoring platform. Starting in version 23.6.0 and prior to version 23.6.2, the Sentry API incorrectly returns the `access-control-allow-credentials: true` HTTP header if the `Origin` request header ends with the `system.base-hostname` option of Sentry installation. This only affects installations that have `system.base-hostname` option explicitly set, as it is empty by default. Impact is limited since recent versions of major browsers have cross-site cookie blocking enabled by default. However, this flaw could allow other multi-step attacks. The patch has been released in Sentry 23.6.2.

Affected products

• Functional Sentry: from 23.6.0 before 23.6.2 — fixed in 23.6.2

How to fix

Upgrade to a fixed version: Functional Sentry 23.6.2. Check the vendor advisory for mitigations.

References

• https://github.com/getsentry/self-hosted/releases/tag/23.6.2
• https://github.com/getsentry/sentry/commit/ee44c6be35e5e464bc40637580f39867898acd8b
• https://github.com/getsentry/sentry/pull/52276
• https://github.com/getsentry/sentry/security/advisories/GHSA-4xqm-4p72-87h6
• https://github.com/getsentry/self-hosted/releases/tag/23.6.2
• https://github.com/getsentry/sentry/commit/ee44c6be35e5e464bc40637580f39867898acd8b
• https://github.com/getsentry/sentry/pull/52276
• https://github.com/getsentry/sentry/security/advisories/GHSA-4xqm-4p72-87h6

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